Just using a LOT of water is a bad idea (unless you eat a good amount, with salt and other nutrients around that time). Because as we all know, this can lead to hyponatremia (at the risk of stating the obvious: you sweat out a lot of salt with the water you lose. Only replacing the water dilutes your blood (serum).
As altitude  increases, the air becomes less dense because of the smaller amount  of air above that altitude. There is a corresponding decrease in  pressure with an increase in altitude. Eventually you reach a point  without air, and the pressure decreases to zero. That is space. + 91 others found this useful.
As altitude increases, the amount of air molecules decreases. Consequently, as altitude increases, air pressure decreases. The troposphere is the layer of the atmosphere closest to the surface of the Earth. Its altitude is less than that of the stratosphere.Therefor, the air molecules are closer together in the troposphere. The air in the troposphere is, then, more dense than that in the stratosphere. Hence, the air pressure in the troposphere is greater than that in the stratosphere.s altitude increases, the amount of air molecules decreases. Consequently, as altitude increases, air pressure decreases. The troposphere is the layer of the atmosphere closest to the surface of the Earth. Its altitude is less than that of the stratosphere.