Kitten with Explosive Watery Diarrhea

I have a 8 month old neutered indoor only male kitten who has developed diarrhea with the consistency of water. It is kind of an orange/brown color and very smelly!!!! I am not sure if he has eaten something.. he has been on the same kind of food for a couple months and it was only a couple days ago I noticed soft stools and then today and last night water like diarrhea. He also appears to strain or at least straining when pooping after the liquid comes out. There is no other symptoms of illness with him. He has been eating and drinking (although today I am not sure what he has actually eaten as there is only dry food out and does not look like a lot is gone) but I have seen him drink water. He is still playful and active. and nose is cool to touch. No vomiting ( I wondered if he could have ingested something or have obstruction somewhere). I am gonna call my vet in the morning but what direction to go I have no idea other than he has foul smelling water diarrhea. Oh and food he will only eat Iams dry kitten food.. I have tried every type including wellness, nutro, etc. and he won't touch them. He does (although not for a couple days) eat moist canned food in a variety of brands incluiding felidae, nutro, wellness, etc.

 

took kitty (Fuzz) to vet today.. I am still awaiting an actual Poop to see what status of diarrhea is.. I have been at work and unsure.. anyway vet thought probably something upset digestive tract and was undetermined of nature. therefore vet prescribed an antibiotic and some antidiarrhea/probios type paste. at this time kitty seems more lethargic as he had a rough day at vet.. he did not like getting his exam or temperature taken and was a wild cat (they claimed he had a fever of 103, however not really a high fever and I know he was stressed which could have caused it to risen and since he is still considered a kitten they run a bit higher anyway) also since there was no stool sample they used thermometer to scrape out some fecal and man he reaalllly hated that!!!anyway vet called it a mild fever and said that if there is no change in a day or so to bring him back.. of course cause it cost a whopping 76 bucks for this.. whew.. where is my pet insurance.. fecal came back clean- no cocci, no parasites.. so at this point we are kinda guessing and hoping it is a mild bug.. we shall see!!! still waiting for a litterbox poop episode to see where we are at .. oh and he just ate a little moist food.. not as much as he normally does but did eat some...