however, something is indeed wrong if he will will only drink the water after eating dry food. Have you thought about giving him Cat Grass to chew on? Cats chew on grass instinctively sometimes when they are not feeling well. Also, my mother is happy to contribute some of her knowledge as she did attend college part time and has some knowledge of Veterinary Medicine in a natural/herbal sense. We will try to think of whatever suggestions we can give to try and help you. Right now, the Cat Grass may be the way to go. By the way, can you please tell me how to say "grass" in Thai?
In regards to the insects, I apologize as I believe that was the inaccurate perception of a New Yorker's/Westerner's idea of what people eat in Thailand! His name is Anthony Bordain and he is very arrogant and travels the world discussing different foods. What people portray to tourists about a particular country is often very misleading from the truth.