Making self tanner is rather simple. Make sure you do this in the bathroom because this can get kind of messy.
get 1/2 cup of cocoa powder and 1/2 cup of any white lotion. Mix these two ingredients together until it's back to a creamy and smooth texture. After this, apply to your skin.
If you want, buy a travel shampoo bottle so you will be able to store more of the lotion; this means you wont have to make it very often. There is also a good chance that the color will fade in between washes so don't worry if that happens. Just put on more whenever it is needed. I hope this helps and works out for you.
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Thanks and happy tanning!