@ysmina-- You could use dry honey that's sold as a powder or as granules. It's usually used for baking but it can also be used in the bath tub.
Most bath additives are dry ingredients anyway. For example, milk baths often have dry milk powder and many bath additives have dry herbs and spices like dried rose petals, dried lavender or dry ginger.
So I think the honey can be used in dry form as well. I think it will be easier to store and use, but it might take a few minutes for the honey granules to completely dissolve. You will still get all of the benefits of honey though.