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Does anyone know how I can create a water sprayer that can be powered by a battery?

Squirrels keep raiding our bird feeders, even though the feeders are in "squirrel proof" cages. 
I plan to fit tilt switches to the bird feeders, so that when a squirrel jumps on them the feeders sway and the water gun sprays them.

I just can't figure out how to make the water sprayer.  I would like to make as much as possible from scratch, so just buying a water gun would defeat the object.

Any advice would be really appreciated.
Thanks

rickharris5 years ago
Buy an electric Super soaker water pistol
http://www.forbes.com/sites/davidewalt/2011/02/16/nerf-super-soakers-go-electric/