Really hope you DD is making progress and you are home soon.
I was in hospital with my 4 year old DD for 7 months (continuous) who went through chemo and a bone marrow transplant, so can hear and understand where you are coming from.
As for meals, get family or friends to prepare home cooked foods. Buy from eBay sectioned disposable containers. Make up meals with your protein, carbs, veg etc and freeze them. There is also a meal rota webpage that ask friends and school parents to help out: www.takethemameal.com
Put frozen meals in a zipped insulated shopper bag with ice packs and you can get a good 2-3 days meals in there - they will defrost naturally, but will last several days.
Snacks, keep healthy as possible as the weight creeps on slowly plus lack of exercise doesn't help. You can now buy pasta pots, soup pots and porridge pots - these are lifesavers. Also get some disposable cutlery as when you go to need some you can bet it will all of vanished.
Drinks - tea, coffee, cappuccino sachets, low cal drinks - preferably screw too lids as you'll never get to drink a full one..!!
As for showing, my DD was in isolation therefore we had our own bathroom, but you can buy baby wipes, body wipes and even home bargains sold towel wipes which were massive...
I hope this has helped. Happy to answer anymore questions.