What is the approximate recommended daily fluid intake for pregnant women, and how does it compare to the non-pregnant RDA?

About 4.5 liters/day in pregnancy due to blood volume expansion, compared to 2.7 liters/day for non-pregnant adults

About 2.0 liters/day in pregnancy compared to 3.5 liters/day for non-pregnant adults

Fluid needs are identical for pregnant and non-pregnant adults at 2.7 liters/day; pregnancy does not change fluid recommendations

About 3.0 liters/day in pregnancy compared to 2.7 liters/day for non-pregnant adults