If I'm a bit early for a punt, I'll buy a drink and a sandwich and leave it in the car for a post punt lunch.
I never eat much before punting and make sure i don't drink too much tea/coffee beforehand as I hate having to have a mid punt piss. It's been unavoidable a couple of times and not only is it a bit of a passion killer but I have to try bending my hard cock into the bog to piss.
Last time I'd gone about 40 mins in an hour punt, we were both really worked up, DFK, me stroking her sopping wet pussy etc, she reaches for the condom and I had to say, scuse me love, gotta go for a piss. Luckily this was a girl I see a lot so we did have a bit of a laugh about it.