Candle jar probably a good idea for a cheap oxygen free environment, though I"ve never done one. A sweet nitrogen flooded make-shift growth chamber would be nice to, and nitrogen is really cheap from any gas supply company. PDA I use mainly for fungal culture though I have had bacteria grow on it, specifically actinomyces. PDA is usually pH adjusted to 4-5 to inhibit bacterial growth so check on that or maybe try a bacterial selective media as well.
There is a really cool jar that I forget the name of that is basically just a pile of mud from the bottom of a lake you sit in a 2 ft tall glass or plastic jar and you can visualize the different bacterial growth types (anaerobic vs aerobic, faculative vs obligate etc) and sometimes see color based on weather or not they use iron. I've been googling all possible word combinations but I can't find it!!! It's named after a specific dude.
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