Please use a straw and rinse the aligners out when you can. You get new aligners every 2 weeks or so, so dont worry about staining.
This is just my 2nd day with Invisalign. The little bit of discomfort is going away. I was told to ONLY drink water when the braces are in, due to the possibility of causing decay. My question is this, how could other liquids (with sugar,etc.) present a problem if I will be brushing within 4-5 hours? Lots of people(without Invisalign) eat candy, etc. and don't brush until 12 or more hours later. Seems to me, exposure for only 4-5 hours can't possibly present much of a problem. Does it really need to be water-only when they're in?
Please use a straw and rinse the aligners out when you can. You get new aligners every 2 weeks or so, so dont worry about staining.
The aligners make it difficult for saliva to wash the tooth structure thereby making your teeth more susceptible to tooth decay. If you need to have fluids other than water make sure you brush before you place the aligners back into your mouth.