Honestly for all those things it doesn't really matter if you get it perfect but knowing you spent a few thoughts on it is already enough to not get blindsided by it. So you're probably fine.

Also for food, remember there's a bunch of things you can eat that fit into that category so feel free to pick one you like and experiment. If it works for you, that's all you need.

Also funny thing, after some time doing long distance running I started craving pasta and potatoes, and I assume that's my body telling me what it needs. Maybe that happens to you as well and that makes it easier for you.