A hide is a place like a bowl thats dark and enclosed, something for the snake to hide in away from the light. Snakes yawn so thats probably no biggie, except i guess its a sign of a respitory infection if they do it all the time. Listen to see if he/she makes a "Clicking" sound..mostly at night when its dark in the room and his/her heat lamp is off. Remember snakes are basically contourtionists, whatever there head fits through they can get into for the most part, so dont worry too much. And that water bowl thing is halarious, the snake got all of the water out?