Any suggestions for DIY co2 ???????

Greetings...

Anybody got any great workable ideas for creating more co2 in my 4' x 8' tent. I cant afford a regular bottle and flow meter for a while so am hoping to create a DIY one. I have looked into fermenting a bucket of beer as well as the sugar+water+yeast option too but would be very open to new ideas from anyone out there. I am growing 32 "stubbies" at the moment and they could really do with some extra co2.

Thanks in advance.
 
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