If you want to wage a friendly war, I suggest taking up the Marshmallow Double Crossbow instead of a Super Soaker. Yes, water fights are fun and all, but a marshmallow fight is just heaven.
Also, while your friend or sibling is using a tame Marshmallow Shooter, your Marshmallow Double Crossbow will surely take them down. Sold for $36, it holds "up to 50 mini-marshmallows at a time, letting you perform rapid-fire assaults on your co-workers from up to 30 feet away," according to Uncrate.
Delicious Dessert Weapons
More Stats +/-
24 Sweet Launchers, Blasters and Small Cannons
Marshmallow Shooter Makes Revenge Sweet
50-Foot Marshmallow Cannon (FOLLOW-UP)
18 Mellow Marshmallows