A Bottle Blasters cap allows you to use an everyday bottle of water to conserve / increase the flow of water, creating a shower stream effect. 90% of bottled water has one of two cap sizes. Our two sided Bottle Blasters cap fits both. People use water bottles every day to hydrate, refresh, cleanse, wash up, first aide, hunting, fishing, and camping. We’ve simply made it easier, smarter, and more conservative.