I buy buckets from a local donut shop for $5 each. These are food grade and they store them without the lids on after they use up the food inside. I for some reason get a craving for apple filling every time I do a water change though..... It's ok though because my liverock smells like cinnamon.
Plastic is made from oil (yep- petroleum). The hydrocarcons used can contain some serious contaminants like sulfur, benzene, and other stuff. These must be removed from the hydrocarbons or you have to clean the plastic bucket and hope that there won't be any leaching. The chemicals used to color the plastic are suspect as well. I assume the plastic used in the food industry is refined to prevent this from happening.
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