I took the existing logo and made it,...rain. The droplets stream down from the river waterfall and form a pool of refreshing delight. The droplets are the exact same in the logo itself. This may look a bit altered, but it's in fact, the same logo with a high chance of rain.

The bottle would be semi-opaque, just enough to see your water level.

This design would be very cost efficient using one color printing and still having a delightful design. I could add gradients and multiple colors but I always say, keep it simple stupid, or KISS. :)