The co2 is up to you.. you can make it on the cheap with water, sugar, and yeast. The active dry you make bread with, I always add a few crushed frosted mini wheats (secret ingredient).
After its done fermenting you can do a public service and distill the waste. Makes some heavy duty liquor, i donate to local bums. The ones that dont do crack, coz crack is wack.. i taught them to grow poppies and buds... They hustle like a mother fucker too. They have a shanty town in the woods that i helped them with. I work construction so I come across extra material all the time. They are like a peoples republic that is manufactured drug free, just naturals, no crime, and they are pretty much vets and old schools.