Incubator alternatives:

Here are tips for growing cultures without an incubator or a warm place such as a hot water system.
Use a 40w incandescent globe, still available from Kmart and Big W but not Bunnings. Place petri dishes side by side and cover them with black plastic (bin liner). To keep a check on the temperature, place a thermometer under the black plastic.
The lamp needs to be 20cm-30cm away from the petri dishes to keep the temperature near to 30 degrees. Optimally, the temperature should be 28 degrees to keep it safe otherwise pathogens may grow.
A heat pad such as those used for keeping reptiles might also work as well as a heat lamp

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