I have no clue if this was already tried already or not(or even if it does work). When making a model volcano the solution used to make it blow is baking powder and vineager. Maybe if this solution is used in a 2 liter bottle and shook with a hose attachment when you press the trigger on the hose attachment the water will explode out. How much output it may achieve will vary on the amount of Baking soda used. This might be the best no pump needed and easy to use water gun.
P.S. Using Baking Soda and Vineager may make you waste unnecessary money!
The Chemic Solution
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