Can I drink Sterile Water for Irrigation USP? Bottle says exp 09/20. I'm not sick, just thirsty?

Hi Sophie, it is basically sterile de-mineralised/ionized water and is safe to drink albeit it tasteless. Tap water is treated so that bacteria will not live in it and is totally safe regardless of how you feel about it (otherwise it would be a frightening public health hazard). Well water and rain water tank water contains a host of microscopic pathogens and should never be considered totally safe. In many areas consumption of such water is unlawful.

If you were injecting it in sufficient quantities it would cause blood cell rupture as they would be unable to prevent filling with water. It is used in dialysis patients for blood volume and weight control as their bodies have no way of clearing salts, toxins or excess fluid. Your uncle must have a health worker who monitors him at home. Leave the water there, it probably is there for good reason. Lets face it, your Uncle probably did not buy it by himself.