Using this Nerf Super Soaker Mini Dunk - Fill is a breeze. First, find a water source. Dunk the tank of the blaster into the water and wait for it to fill up. You'll see it refilling instantly. Once it's full, you're ready to play. Just pull the trigger to shoot water at your friends during outdoor water games. As for safety, make sure to use it in an open outdoor area and avoid aiming at people's faces. Also, keep it away from small children who are under 6 years old. For maintenance, after each use, empty the remaining water from the tank. Store it in a dry place to prevent any rust or damage. This way, your water blaster will last for a long time and keep bringing you lots of fun.