Co2 ratios

I'm on my way to the store to pick up some yeast for my co2 I'm new to the site but i still cant find some good ratios right now i want to use 20 oz bottles for my co2 release, does anyone know good ingredient ratios for a 20 oz bottle thank you for any help

it doesnt really matter just throw water sugar and yeast together, more sugar than yeast. When you shake it and it doesnt make bubles anymore, add sugar...when that stops working add yeast. You have to have a really small well enclosed area for co2 from sugar and yeast to do anything, I think its a waste of time. Save your money and get a co2 tank.

I want to get a tank eventually but this is for right now, and I am gonna try something with the bottle to try and make it more efficent I'll see how it works thanks for the advice.