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The recommended daily water intake for a typical adult engaging in moderate exercise is generally around 2-3 liters. This guideline takes into account not only the basic hydration needs of the body but also the additional requirements that come with physical activity.

Moderate exercise can lead to increased perspiration and fluid loss, necessitating a slight increase in fluid intake to maintain optimal hydration levels. The 2-3 liters recommendation aligns with general health guidelines suggesting that adults should drink adequate amounts to keep well-hydrated, which typically amounts to about 8-10 cups of water daily. When exercising, especially under moderate intensity, it's crucial to replenish the fluids lost, thus reinforcing the need for water intake within that range.

The other options suggest amounts that exceed this moderate intake recommendation, which may not be necessary for everyone and could lead to overhydration in less active individuals or those not engaged in higher-intensity activities. It's essential to adjust fluid intake based on the intensity of exercise, environmental conditions, and individual hydration needs, but for moderate exercise, aiming for 2-3 liters is seen as an appropriate target.