Our DS did nothing for himself when living at home, literally nothing. He'd not wash/clean his teeth/shower without us nagging him. He hadn't a clue how to prepare food, wash his clothes, etc - we did it all! He was, literally, a passenger in our home. We really, really worried about how he'd cope when he went to Uni. He wasn't bothered at all, showed no signs of worrying etc. He didn't even do any packing/preparation despite us nagging him, and the day before he went, it was us doing the packing/shopping etc for him as he'd literally have taken his games console, laptop, phone and ipad and the clothes he stood in!
But he went and survived very well. He made do at first, wearing the clothes we'd packed for him and using the cutlery/crockery/basic foods we'd sent him with. When he ran out of clothes, he had a choice of going to buy new, or finding the laundrette! When he ran out of tinned/packet food, same choice, go and buy or pay for takeaways. He basically just started googling for everything. He googled for how to use the washing machines, which washing powder/conditioner to buy, how to use it, googled for different temperatures for different clothing types, etc. With food, he googled how to make an omelette, how to fry an egg, he followed youtube videos by people suggesting meals for uni students (using basic ingredients and basic equipment etc). We facetimed every day, but he barely asked advice on "home" things as he just googled it all!
It's amazing what they can do when they have to! The internet, social media and youtube is amazing as sources of advice for things people don't know how to do!
He's now been out of Uni for 2 years, has lived in 3 different flats moving around with his work, and well and truly self sufficient. The difference in just 5 years has been incredible to see. We'd never have believed he'd manage so well. He even does batch cooking, regularly makes "proper" meals (meat and two veg etc). Sometimes you just have to take a step back and let them work things out for themselves!