Shinichi can feel Fish's gaze on him and he very much does not like the feeling. He is actually fighting hard not to just shudder from the uneasy feelings he has. But-if he wasn't going to question the water bottle actually being full then who was he to argue?

"We can't give him that water!" Conan did his absolute best to look like a horrified and appalled little seven year old. "People go the restroom in there! He needs water from the Kitchen!"