Food (not too heavy) and drink can be consumed few hours before the jump without any problem. Please do not arrive with an empty stomach! Blood pressure may drop easily after the jump on an empty stomach, which can lead to symptoms of slight dizziness or minor indisposition. Free fall does not resemble the roller coaster at all, so you don’t need to be afraid of getting sick! However if you have travel sickness (you are usually sick in a car, on a bus or an air-plane), it is recommended to take the right medication before the jump!
Consuming alcohol 8 hours before the tandem jump (according to skydiving rules) is not allowed and parachuting with a hangover isn’t the real thing either.