Hi - We took in a newly-spayed, tuxedo kitten from outside three weeks ago. Sadie is bonding well with us and our other cat isolated in the main bedroom/bathroom - about 450 square feet. She comes to us and wants attention and petting. Immediately, we noticed her excessive drinking. She was drinking a quart of water per day and flooding her litter box. We took her to the vet who had to anesthetize her to exam her. Her bloodwork and urinalysis came back as normal. She was boarded at the vet overnight and showed the same behavior. To reduce stress, we added an additional litter box with different litter and two new cat trees with toys. We are offering her small amounts of water throughout the day and evening, but this behavior is not changing. The vet has no advice other than to see if it resolves. I've fostered many, many cats over the years, but this behavior is nothing I've ever encountered. Any suggestions? Thank you!