The case against bottled water is Hulk-strong. From paying $3 for something that falls from the sky, to the fact that stuff like Dasani is nothing but tap water, there are more reasons to bail on bottled water than Saw sequels. The makers of the Kor Nava ($30) claim they’ve created the absolute best way to forge your own path to fresh H2o. The bottle’s built-in filter is made out of coconut shells that are converted into activated carbon to purify the water. The push-button cap keeps dirt, germs, and most varieties of electric eels away from the drinking spout. This may be the second best use of coconut shells ever. This is obviously the best.