Oh Jen, I am so happy to hear that your sweetheart Rutherford is back home!! His belly looks terrible now, with all the hair shaved and the incisions; but that hair will grow back fast, and give him his dignity back . He is such a sweet boy, I understand why you are so fond of him!! Give him a big gentle hug and lots of skin-scratches from Lu!!!
Hey, about that drinking problem: I have an idea! Cannot you learn him how to drink from a bottle that hangs upside down? Difficult to explain, but it looks like a drinking bottle for birds and rodents. My cats used to have that, but never used that... . It was made for cats!
Good luck