1) "Normal" water might be just fine. It all depends on what you're growing and the water chemistry itself.
2) Condensate from a dehumidifier is basically distilled, only instead of putting the energy into the evaporation part of the cycle, we put it into the condensation part.
As such, it is close to pure and is unbuffered, so adding a fertilizer intended for tapwater will likely give you a solution pH that is dangerous to the plants. You can either adjust it or use a fertilizer intended for pure water.
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