When making ginger beer, I gather from reading the forums that you actually dont want oxygen to get in. I think it makes the process faster of yeast eating up the sugar and turning it to alcohol.
So far I have been doing it wrong by putting a breathable cover (cloth) on the top. It will still work but putting a one way valve would be better. The CO2 can escape without letting the O2 in.
This is my el-cheapo solution....
... a balloon over the mouth. I washed the balloon inside and outside first. And made sure it was dry and not sticking to the opposite balloon wall before placing it on top of the bottle.
After one day the ballon has expanded...
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