I finally managed to get a look inside Bugs's mouth and confirm what I've suspected for about a month: Bugs has a rotten tooth that'll have to come out. I've got this covered. Just gotta figure out which vet to take him to.
@POOetryma If he's losing weight, you might grab some nutrient gel. I'm using it to boost the kitten's nutrients right now, he's not fond of the synthetic milk and his stomach can't handle much beyond milk and rice. Bulked him up decently enough.
@tippitiwichet It may explain why he'd rather drink milk than eat solid food, even the wet stuff.