Good that they're able to get Chico in relatively soon, it's nice they are going to check on his eating habits before the procedure, often cats we think will not eat while away from home do much better than we thought they would. Cats really are very adaptable creatures, the hospital will leave out food for him to snack on through out the day if he prefers it that way. You are of course able to give them instructions on what he likes/doesn't like etc so even providing his favorite food for them to feed him while in clinic shouldn't be an issue.
Avoid biting when a simple growl will do
The Spirit Lives As Long As Someone Who Lives Remembers You - Navaho Saying
Vindication ~ For all those pets who became sick or lost their lives from tainted pet food