The best way to get co2

Has anyone got any info on the best way to get co2 into my grow tent, I have seen packets, infusers etc. I need enough for 5 girls

All you need is a couple gallons of hot sugar water and some yeast. You can make alcohol and co2 at the same time. But unless you are in a sealed environment with almost excessive amounts of light you don’t need it

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Great thanks mate

Bottle! With gauge! Is the best way!

Thanks man