Most cats that are neutered are not normally off their food for more than a day. You should contact your vet if your pet does not eat for more than 24 hours after surgery. 2) Exercising your cat after neutering: It takes 7-14 days for castration wounds to heal after surgery.
L-Glutamine is a supplement which contains an amino acid. It is most commonly used by bodybuilders and endurance athletes, to help them build up their muscles and lose weight, but there have also been a number of research studies which show that glutamine is linked to intestinal function. It is most often recommended for diarrhea.
If you want, try an herbal tea as an alternative to water. Also try Gatorade; it has many more minerals that help calm your stomach. If you're puking or have diarrhea, it's especially important that you stay hydrated. Your body is losing fluid at an alarming rate and it should be replaced as soon as possible.