This recipe will make up 250ml of bath oil which can be packaged as you desire.

232ml massage bath oil (92.8%)
10ml polysorbate 80 (4%)
8ml fragrance (3.2%)

Measure quantities carefully into a jug.  
Stir well.
Pour into desired container.
Add two tablespoons (or amount you desire) into your bath water, relax and enjoy.