This video discusses growing peppers and tomatoes by a suspended pot, non-circulating hydroponic method (commonly referred to as the Kratky Method) which does not require electrical power and pumps.

Here are some relevant articles;
Non-circulating hydroponic methods for growing tomatoes.
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Observations on a Non-circulating hydroponic system for tomato production.
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A suspended pot, non-circulating hydroponic method.
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