Just wondering if this could be a temporary fix until I get a a filter that removes fluoride?
If one of these happens to be fluoride free, and I start drinking it, is there any additional info I would need to pay attention to?
Distilled water should never have fluoride if it uses a carbon filter after distillation, the only problem is it is 99% water which is lacking in natural minerals but you can add those in yourself if you want. This is why distilled water tastes flat.
As far as spring water, it depends on the brand. You want water that has had reverse-osmosis.
Ozarka claims it doesn't have any amount of fluoride in their "natural spring water", I drink that myself.
Here's the source for Ozarka's fluoride free waters: https://eservice.ozarkawater.com/service/help/aboutourwater.aspx
Distilled no, spring/sparkling/mineral possibly (usually insignificant amounts, although there's variation).
Look at the pdf for some info from WI: http://www.dhs.wisconsin.gov/publications/P4/P44559.pdf
What exactly is your concern? If you're getting a filter, presumably it'll be soon. Unless your water is unsafely laden with fluoride, a few weeks isn't going to affect you negatively.