So I've had the DIY CO2 generator (this one: https://www.amazon.com/dp/B08NWWKQHB?psc=1&ref=ppx_yo2_dt_b_product_details) in the tent since weeks 2-3 of veg, but just today went to the dollar store to upgrade my 2L bottles to 96oz (2.84L) bottles and figured no better time to post it than now. Hopefully now I won't have to refill it every 3-4 days since it's been on full blast since flower started. It's controlled by a 12 volt solenoid that's on the same timing cycle as the lights for optimum photosynthesis. Tried the yeast/sugar jug at first but after some digging around found this to be the most efficient and consistent system (within budget) for the size of my tent. For the larger bottles I just took the same standard ratios recommended for the 2L's and blew them up by 2.5x (500g citric acid, 1500mL water; 500g baking soda, 500mL water).