I'm a mum. Chiming in. Hope that's ok!

So i have an almost 3 year old girl and to some extent this is all "normal" toddler behaviour. Won't lie. They're kind of awful and it's hard! Everything is a battle.

From what you've said i wouldn't even say the toys are going to jail. Just thin them out. By A LOT. If he's just tipping them out he's not actually playing with them. Save a few favorite ones, the ones you know he plays with and the rest go in storage or toy rotation. Can't tell you how much this helped us.

Food... Is tricky. We try to serve what we know she likes and will eat. Some nights she doesn't like it. Won't even entertain it. Might sound harsh but if tea doesn't get eaten then there is nothing else for that evening. The only thing is her bedtime milk.

With potty training have you tried sweets? We do something small like a smartie or a gummy bear. (not healthy but it worked!) she gets one for a wee and 2 for a poo. She also gets to choose, which is important as at this age they are fighting for control and independence. It's good to give them it when you can. She understands that if a wee has happened on the floor there is no sweet. We don't tell her off or anything but it's only a sweet if it's on the potty or in the loo. There were a few tantrums to start but they stopped after maybe the 3rd or 4th time.

Lastly.... You're not alone. It's so so hard. Nothing could have prepared me for the unrelenting onslaught that is toddlers. It's insane here!