honestly i drink diet dr pepper,not fast just sips.the reason we are not suppose to drink it is because of the carbonation.I waited til i was about 2 months out,then I had some,man it never tasted better.i used to drink a good 2 liter a day,but i quit. i just get tired of water, even flavored water. so i tried it and it was okay.I will never drink as much as i used to. and the only difference between water with crystal light in it and diet soda is the gas,so I say why not,actually crystal light has calories in it 5 i think and diet soda 0
but thats up to you,I m not saying sure go ahead, just saying what i do