My vet never supplied, or suggested anything for either Kai or Zev when they were "done". Kai was done as an adult male cat, and Zev as a 6 month old female kitten. As I recall, I kept Kai in for a day or two, as you would with a human that had been under a general anaesthetic (OK, not kept in, observed, but you know what I mean!). Zev was kept in the spare room for most of that time, as she had been for the first 6 months, when she wasn't wandering around the house with Kai.
Both were fairly active, as I recall, although I'd imagine keeping them indoors would be a good thing.
I'd imagine that both eating and drinking could be a bit more difficult with the 'cone of shame' on, unless you've got something like a spaniel bowl.