I'm in a similar situation. I can't give an answer because the only times I've used to official coaches was when we were away at Liverpool and at Wembley with Notts Ladies. I took alcohol on board, but only drank it when we stopped at the services or arrived at the ground. I can't see soft drinks or food being a problem on the coach. I have to follow a gluten free diet and football grounds don't cater for people like me, so I'll be taking something to eat. I'll also be taking something to drink, but it won't be non-alcoholic so whether I get away with it remains to be seen.