That's a really nice little waterfall, water for the guerrilla grow.
I tried to prepare a spot near here using sphagnum moss which was everywhere and mixing it in, it was too cold though, year before last, seedlings died. Real good spot near town but surrounded by bushes not visible and even in a gully lower than the surrounds with like only one way in.
I dunno about all this rosin stuff, I only ever think like use ethanol or isopropyl to make hash oil for medical use, like to eat caps before bed for like cancer. Other than that I just got my springer I made from bunnings. It's got a big cone too.
All you need is some tube, a juice bottle, a screw clasp, copper downpipe (special to me not aluminium), cone, plumbers tape and a glue gun.
Here's a pic.... (real nice photo too)