Posted: 19/05/2016 at 11:14
As regards the panic, try reading this:
If you're only used to swimming 200m repeats, then slow waaay down and concentrate on trying to keep as aerobic as possible. You'll probably find it feels quite constricted in a wetsuit first off (breathing is harder, shoulders feel tight).
Nutrition on the bike is very much down to what you can stomach without it coming out in an untimely fashion at either end. It's easier to digest stuff on the bike than the run. If it's not blazing hot I'd have thought one bottle should be enough.