I use 1 tsp gelatin in 2/3 cup of water. I let it sit 15 min or so, then put it in the microwave for 15 sec. I continue the 15 sec bursts until I get to ~150*F (usually 4 bursts).
I pour the mixture into a clean sanitized 2L plastic bottle. I squeeze the air out and put on a carbonator cap. I pressurize the bottle with a bit of CO2 until it pops back into shape (very short bursts required). I PULL THE KEG PRV to depressurize it, place a jumper on the bottle, invert the bottle, connect the jumper to the gas in post, allow nearly all the liquid to drain into the keg and quickly disconnect it before it all empties into the keg. This way I don’t introduce air into the keg.
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