English: The drinking water gun from the Command Module for the Apollo 10 lunar mission. The Apollo 10 crew used this gun to drink water in the Command Module's zero-gravity environment, either spraying it directly into their mouths, or adding water to their dried food and drinks. The gun sprayed 0.5 ounces (14 grams) of chilled water for each activation and had a counter to record drinking water usage. Drinking water was produced automatically as a byproduct of generating electricity from the spacecraft's hydrogen fuel cells. Displayed at the Stafford Air & Space Museum, Weatherford, Oklahoma, U.S.