Slow cooker prep....how far in advance can I refrigerate?!

[Hopefullhopeful]

I fear this may make me sound a bit of a wally but to cut a long story short....

I care for my grandad who doesn't live close by. I've arranged for hot meals to be delivered twice a week and he has home help go in once a week mid week. However weekends and a day in the week he has to fend for himself.

I use a slow cooker for my partner and I and have frequently thought about purchasing a 1-2 person crock pot and pre making grandad some meals to throw in himself when he wakes up.

My question is.... If I pre mix some slow cooker recipes how long will they keep in the fridge?? (Freezer isn't really an option)
If let's say I buy chicken thighs that have a 5 day use by date, does that date still apply if I've taken them out of the original packaging??
(In an ideal world I would pre mix, say, 3 meals for him to use over the course of a week use by date permitting)

Is this possible??

Could you do 2 days worth of ingredients so he cooks 2 portions then eats one portion and put the other in the fridge for the next day?

If you take him a meal on the Friday and do that as well that's the weekend sorted maybe?

@MassiveOvaryaction he has his hot meals delivered on a Friday so I wouldn't be able to put something in for him then. It'd also always be after work that I see him (I live nearly an hour away so it's around 7pm that I pop in)

My worry with that (and I am a huge worrier) is that he wouldn't reheat sufficiently and it'd make him poorly OR put him off using it all together.

It's not out of the question ofcourse but would only really work on a Friday evening to cook ok the Saturday and reheat to eat again on the Sunday.

Check the instructions on the pack. Last week I had this issue and the pack of minced beef said you have to use it within 24hr of opening.

Can you premix stuff for the crockpot on let's say Sunday, your grandad would put it in on Monday and freeze the leftovers?