Hi Packfish,
Could you tell us more about what is going on. How old is the goat? What do you mean "water" belly? Do you mean he is bloated? Could he have gotten into something poisonous? Did he get into the feed/grain buckets? Or Are you thinking it could be UC?
Please give us more details and if his condition gets worse, I would re-post to the 911 section and/or call someone you know could help(see the members list).
Without knowing any details I would suggest gas-x, pepto and baking soda. If you think it is UC, that is another story. I would immediately call a member.
Keep us posted on his progress.