That's awesome. I'm making a waterfall with a Grey Goose bottle. I'm also gonna make a grav with a 1.0 L and 1.75 L Dragonberry. Pics will be posted soon.
I usually just use a 2 liter. and submerge it in water. not a big waterfall guy but i still fuck with them on occasion.
Waterfalls make me cough so hard I get sick. I used to rock them back when sobe had the glass bottles with the weak spot.
My friend and I made a waterfall with a 2 gallon gatorade bottle, we passed it back and forth 3 times from 1 use but the smoke got pretty stale so we trashed it