Because there's no tap water in space. Whatever they want they have to bring with them the ability to recycle body waste reduces the amount of stuff they have to bring from Earth.
If you want to eat in Antarctica, you have to bring your food with you. All you will find there is ice.
Drink lots of fluids the first 24 hours. Jello and popcyles are good too! but dont drink your liquids to fast you want them to absorb into the body instead of letting it build in your stomach causing your body to want to bring it back up! then after this slowly bring in food..very bland food such as crakers bananas and applesause!
you should bring food and something to drink
drink
beer
HAVE SEX...IT HELPS
Beer
Sangria
You can bring food and drink, just not alcohol.
water
Yes you can.