I've been trying to make my own DIY Co2 Generator/Inhector. whatever you want to call it. Basically it's 2 bottles. The first is filled about 3/4 with water a cup of sugar and a tsp of yeast. The second is just water. Drill one hole in the cap for the yeast solution and two in the water bottle cap. Plumb them with air tube. Have the yeat solution line above the sotion inside and have its other end going into the water and in the water. The other hole line is out of the water in the bottle. The solution makes gas and passes into the water bottle. It bubbles from the line in the water, rises and escapes through the other hole. I wonder if theyre are any beer people ou there they can tell me if I need a specific yeast. I'm not getting the reaction I want. Slo bubble count. I used brown sugar and active yeast. I'll post a pic later.