Can I Drink Sugar Free Strawberry Water with Invisalign?

I would check the ingredients on the sugar free strawberry water.  There are often flavorings like citric acid used in sugar-free drinks that result in you not having a normal pH in your mouth and over time can give you cavities.  Diet Coke, for example, does not technically have any sugar in it, but would be a definite drink to avoid with Invisalign aligners or braces in place as it is acidic.  You can have the strawberry water or a Diet Coke with a meal and then brush your teeth, but you want to avoid sipping on it all day long. Invisalign aligners can be cavity incubators in those circumstances. Hope that helps!

Drinking fluids that are sugar-free and colourless should not pose any trouble while you are having your aligners in.   You also want to check and make sure that the flavoured water you are drinking does not have a high acidic content.  To be safe, just rinse out your mouth and aligners with regular water once you're finished with your flavoured water. 

Yes!. A long as it is sugar-free and colorless, there should be no problem drinking it with your Invisalign trays in your mouth.