saultgirl, I just had mine done on May 1 … the not drinking much and not peeing was my experience too. Funny how my memory is fading already, but I want to say that I was really worried for her the first 24 hours and I kind of wanted to call the vet (mine came home on a Friday too), but of course she was much better enough by Monday that I didn’t call.
(Well, I did call, but about something else … turned out mine also had a massive bladder stone, so I was calling because she was peeing blood, but that wasn’t a complication of the surgery.)
As to the cone, my vet said I didn’t need one at all, but could purchase a “soft cone” from them if I wanted. Since my pup had been a stray before me I just had a bad feeling and bought it. I ended up glad I had it. We tried to go without, and she was mostly pretty good if she were right with me and watching tv or something. She might try to lick, but I’d push her head away and we’d be good for a while. But putting her up in her cage, she would start going to town on the incision area. So I used the soft e-collar on her for about 4-5 days at times where either I was not closely supervising her or she was on the leash to go out and go potty.