My wife and I are potentially adopting a cat.

The cat is an adult, not sure the exact age (but will see if that’s known when we get it).

The long story short is, a close friend had 3 cats (I think strays as kittens but not 100% sure, I think they were acquired at different times - they do not appear to be related to each other), but due to the current political state of the US ended up moving abroad on a visa for this past year, and is planning on staying away for longer. Initially, the cats were staying with another friend but that has recently fallen through (I think they did not expect the 3 cats to be as much to handle as they are, they keep getting onto counters, eating food that is left out/left unattended, and scratching furniture, and at this point they’re getting fed up with them), and we were asked if we could take any of them

We have met the cats quite a few times, and they do seem friendly towards us.

My wife seems very allergic to one of them, but only mildly allergic or significantly less allergic to the other two.

We currently live in an apartment that does allow pets, but this would be the first time either of us have owned a cat, so unfortunately I think we could only take one of them.

I’m thinking we could probably use some advice on things to consider and best practices.

Preliminary research has said to get 1 or 2 litter boxes, feed at regular times, running water bowls are preferred, and get lidded trash cans. We plan on keeping the cat on the same food and litter type, at least initially. I know there are other things, and we will take the cat for a check-up and establish a vet. Due to my wife’s allergies, we are planning on keeping the cat out of the bedroom and running an air purifier there, and hopefully visiting an allergist before we adopt the cat if time permits.

But I’m wondering what others’ experiences have been with a cat in an apartment and what advice you may have? (How to keep them off of counters? Keep them from getting bored while at work or while working from home?)

Caveat: I'm following up with my vet for most of this, but she's newer and is having to do a lot of consulting with other vets in the practice.

Info: I have three cats,

• adult female - Nova, 13ish?
• adult male, Pippin 3ish
• male kitten - Fig 5 months (he's very sneaky)

Ok so, my girl Nova has been diagnosed with diabetes. This has entirely upended our feeding schedule and she's not coping well with it. We'd previously used some automatic feeders that dropped food 6 times a day, because she would stress out about not having food and then overeat and would throw up in both scenarios. But now all three cats are on different food (all kibble), and at least Nova would prefer to eat any food but her own, or have seconds, but the others would too if left to it. So they're being fed in different rooms at the same time.

Nova is ravenous, aggressively trying to drag her bowl out of my hands, headbutting the tub of her food (she caught it loose once) across the floor, running to the other bowls in case there's CC. food left once they're separated. She just dove for one as I was trying to just let a cat out of the room instead of pick the bowl up. She's always under my feet in a way that she used to be good about avoiding. I've stepped on her several times, and hurt my ankle and wrist last night catching myself.

Any suggestions for the perpetually (thinks she's) starving cat? I just got her a glucometer and am figuring it out but haven't been taught how to adjust her insulin as of yet.

Part of the difficulty here, and another area I need solutions in, is that she'll (mostly) inadvertently scratch my partner's leg when she wants his attention usually to be fed. I think occasionally it's intentional but he uses a wheelchair and mostly can't feel the leg - a cut can be dangerous for him, but also sometimes the touch/pain sets his leg off in a spasm cycle that is incredibly painful. On a bad day he's feeling guilty for how angry he is at her and is afraid he'll hit her (he probably wouldn't, but he doesn't have the control to say intentionally tumble her like a mama cat to a kitten, and she would probably claw or bite if he tried plus she's been sick and he's already afraid of hurting all the cats with the chair.) he's done the spray bottle thing in the past, she likes water and we know it's not ideal, but it's usually something that happens when he's not looking or can't see or hear her til she gets him.

Finally I need a better storage method for the food. Something she can't headbutt open or into dropping food, but that I can leave out in an open space. Currently I have a bag in a bathroom vanity, a tub of the Rx food in a spare room, and a bag in a closet. They have torn the bags open in the past (working together as a team, I suspect) when they're not secured.
I've thought about the microchip feeders but the youngest isn't chipped yet and frankly they're really expensive.

Summary of Asks:

• Help with a diabetic cat who's perpetually starving
• Help with getting a cat to stop scratching a human's leg who can't see it coming (addressing the first might help)
• Help with ideas for cat food storage/dispensing that would be more accessible than 3 bags in 3 closets in 3 rooms, two of which my partner can't access.

Bit of a vent here too, just everything is expensive right now too so I'm trying the best I can. Pics added.

I have a simple gravity fed cat food dispenser that is great but it needs a little help. No matter what gravity feed dispenser I use it never keeps up. My cat has food out 24/7 and he regulates his food on his own.

I 3d printed a new dispenser in hopes it would solve the food falling out constantly all day, but it's not working as I expected.

So what I'm hoping to do is make a simple vibrating device that will help the food fall out constantly all day long. Maybe a raspberry pi that has a cell phone vibration fob thing that will run a routine? I don't know. I'm having a really hard time finding examples of this. Does anyone have something to reference?

Also open to ideas on non-mechanical feeders that work well, or very simple battery operated options.

Thanks!