To make a salt bath as one of the photo takes just a few ingredients, some may naturally be chosen as the type of salt, the plant or flowers or fruit or vegetables that you want to include in the bathrooms.
for example you can grate carrots or cucumbers or apples or peel of orange or lemon or chocolate, or chop fresh rose petals or even crush them in a mortar with a little salt and so do also with herbs such as rosemary, cinnamon, sage, mint or vanilla pods or coffee beans. you can use coarse or fine sea salt combined with epson salt or salt of Hymalaia, also add a little honey or milk right away if you want to use the salt bath and make it more hydratant yet. If you have more time you can also, using citrus, squeeze the juice and put it on the big grains of salt and let it soak for a few days, always remember that the salt must be moved often and left to air. Then mix everything and put back into an organza or linen bag and put in the bath and relax .. in the arms of nature!