Dont EVER drink DI Water, there is a huge possibility of you catching Legionaires Desease !!, This is due to the way it produces Neutral water, an R/O System is really deisgned to take out all Toxics, it can produce dreaking water from drainage water, the water coming out of the R/O unit then goes thru a different filter an active carbon filter which puts back whats needed to make it drinkable, drinking straight out of the R/O is not recommended as pure water is too aggressive for your stomach, it will collect calcium magnesium etc from your stomach and basically rape you from inside.
The DI water. due to the fact that it remains in a Vesile for longer periods can collect bacteria which can cause serious health issues, its OK for cleaning but NOT for drinking "Make sure no one tries this"
Terry