Hello and welcome!
My advice would be to follow the post op eating and drinking advice of your team to the letter. It's vital for recovery that you stick to each stage. Also, that when you are back onto solid food you focus on protein and veg and fruit.
Thinking of having small treats is fine when you have lost most of the weight you want to but in order to maximise your losses, it's probably best to focus on the good stuff.
Being near a toilet can be handy if you've not chewed your food properly and then, yes you might bring the food back up but it's not the same as vomiting - this is why the 20, 20, 20 rule is so important and used by so many successful banders. Aim (but don't exceed) to eat 20 mouthfuls of food for a meal, over a 20 minute period of time, chewing each mouthful 20 times and putting your knife and fork down between each mouthful.
Good luck x