All you need for your own water warfare games are a few basic supplies.
For shorter games, or games with only a few people, you'll usually only need
one water blaster. For longer or larger battles, gear up with a main blaster
and a "back-up" blaster. Extra "ammo" (some water bottles or a bucket filled
with water) is a good idea too.

• Some water blasters
• A hose and/or sprinkler to refill blasters
• Buckets of water to refill blasters (also good for drenching at close range!)
• Water bottles for extra "ammo" during a longer battle
• A small bag, belt or clip for carrying smaller blasters
• A backpack for larger water blasters and extra "ammo"
  
  

Of course, all gear is optional, it's up to you and how you want to play the game.