Rubbermaid Grow Box & C02

Hey folks. There is a wealth of info on this site:thumbsup:, but I have a question or just want some ones experience. I am using a Rubbermaid grow bow. Computer fan on top and intake air on bottom, with 6 daylight CFLs @ 5000k in my vegetative stage. Well I'm going to have to move my box due to curious little eyes; ( I don't know how long my 7yr old is going to believe that we have a homemade humidifier in our bedroom that lights up:wtf:). and when I get into my 12/12 cycle, I have a locked closet in the basement that will help keep total darkness when we need it. I'm using bag seeds and on a tight budget.To the point!! I'm wanting to be able to add C02 to the set up, because we rarely use the basement and there will not be much C02 down there, especially in the closet. Does anyone have experience with using a cheap set up with a small grow box. Yeast, sugar, water, bottles, hoses and etc...any input would be greatly appreciated. Don't have pics yet. Having camera issues.

something that small one of those soda set ups might work fine or one of those "exhale" cheap co2 generators(its just basically harmless fungus that puts out co2) theyre like 30 bucks and supposedly last 6 months.