The term 'supply water to' can be summarized by the crossword solution 'hydrate, ' which is a seven-letter word. Hydrate is a verb that means to provide an organism or object with water or moisture, usually in order to maintain health and vitality. Hydration is an important part of many living organisms' life cycles, as it helps to regulate body temperature, lubricate joints, and transport nutrients throughout the body. Additionally, hydration is essential for plants, as it helps them to absorb nutrients from the soil and grow.