As Arthurs BunMum says, a lot of it is a waiting game.
It is recommended that the bunny gets a water bowl after surgery since it may feel too bothersome for him to deal with a bottle. If he normally drinks from a bottle, there’s no reason why he shouldn’t go back to doing so once he feels his normal self again.
As with people, bunnies respond individually to having been put under. Some perk up right away, others eliminate the drug more slowly from the system and stay subdued and a bit confused longer. You need to see to it that he is keeping warm, rabbits can get hypothermia after surgery and that’s dangerous. You can give him a hot water-bottle wrapped in a towel, if he feels cold he might snuggle up to it. But make sure there’s enough space for him to move away from the heat-source if he wants to.
You can feed him his favorite foods if you like, f ex freshly rinsed leafy greens, small piece of apple/carrot/banana etc: Whatever he eats is good for him right now. He needs to eat to keep his tummy in shape + to keep his body temperature up. 10 individual droppings are of course a less than ideal amount, but the fact that there are droppings at all is great. He probably needs to eat a bit more though. Sometimes a bunny will like canned pumpkin (not pie filling, just plain unsweetened pumpkin), you can mix it with crushed pellets and if he won’t eat it on his own, (sometimes they like eating from a spoon for some reason) you can syringe feed it to him. Or you can just mix crushed pellets + water, just so he gets enough food in his GI system.
Behavior-wise, any and all peculiar behaviors can be expected these next few weeks. His hormones will go crazy, then eventually die down. In some bunnies this is hardly noticeable, in other bunnies, all the unwanted behaviors of an intact male will become twice as as bad as before the neuter and you might see territorial aggression, urine-spraying, humping, poop-marking etc. But time takes care of that.
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