Those who use a diy co2 can you help me??

[andyjs]

I tried the hole in the 2L cap and it always leaked for me. I went the hardware store, bought rubber stoppers w/ a hole and really small copper tubing that an airline fits over. Works much better

 

[cassharper]

try buying a different batch of yeast...it could also be a leak like the others said. i mix my yeast in water thats about 112 degrees or so then add it into the bottle with the sugar and top it off to where i want it and it makes CO2 fast.you dont want it too hot because it will kill the yeast

ditto first part. Brewers yeast (you can buy it at homebrew stores) and (harder to find) champagne yeast work great for these applications