I take mine with Epson salt. They are the best when your swelling :)
Bad if they are over 104 degrees, get a bath thermometer. No hot tubs, soaking a long time in them can raise your body temp too high.
Yep just don't take them if your water breaks.
No its fine to take bsths. As long as your baths are not to hot to rase your blood pressure you are fine. My doctor recommended them to me to help with lower back pain.