You will need a CO2 tank & gauges that will cost about $75 new or $50 used. The 2 litre bottles are easy to find for free and a tire valve stem will cost less than $1. You simply drill a 1/2 inch hole through the center of the 2 litre bottle-cap and pull a tire valve stem trough it with a pair of plyers. After that you just put a tire filling fitting on the end of the CO2 hose and you're ready to go. Fill the bottle to the level where the bottle neck begins (about 3 inches from full) and squeeze the bottle to purge the air in the top while tightening the bottle top. Then put it in the fridge to chill. When cold pressureize it with the CO2 to 20lbs pressure. Shake the bottle vigerously for 30 seconds and hit it again with the 20lbs pressure. Do this 3 or 4 times and then allow the bottle to sit with 1/2 hour to settle and then drink your carbonated beverage.