Things You'll Need
Instructions
Drill a hole in the cap of your bottle. Insert the tubing in the hole and secure with a bit of epoxy glue. Allow the glue to dry.
Put the cap on the bottle and screw it so it is tightly connected. Insert the adapter into the hose and attach the garden hose nozzle.
Remove the nozzle to fill your water gun, making sure the bottle is in an upright position. Replace the nozzle, aim and pull the trigger to spray your target.