Put the aloe vera juice, oats, and any dried herbs you'd like to infuse the lotion with in a bowl. Cover and allow to soak for 24 hours at room temperature away from direct sunlight.
Run the oat infused aloe vera juice through a clean tea towel over a bowl and squeeze out the liquid. Discard or compost the oats.
Measure ½ cup worth of oat infused aloe vera juice (if there's not enough, add more aloe vera juice until there is). Set aside.
In a glass bowl, place the almond oil, coconut oil, beeswax, and honey. Heat over a saucepan with shallow simmering water (making a double boiler). Heat until completely melted.
Allow the oil mixture to cool down until it touchably warm, but no longer hot.
Stir in the vitamin E, leucidal liquid SF, arrowroot powder, and any essential oils
Pour the ½ cup oat infused aloe vera juice into a large bowl or the bowl of a stand mixer.
While running a handheld or stand mixer on low, slowly (in a very thin, slow stream) pour the oil mixture into the oat infused aloe vera juice. Whip until thickened, fluffy, and lotion-looking.
Pour the lotion into a pastry bag (as used for cake decorating) or a plastic zip bag (snip off a corner after filling). Squeeze into an empty lotion bottle. Alternatively, just put it in a glass jar.
With the preservative (leucidal liquid SF) in it, you can store at room temperature (75° Fahrenheit) or less for two weeks or longer (how long depends on where you live, humidity, altitude, etc.). To ensure it will last longer, you can keep it stored in the refrigerator (though it will lose it's pumpableness if you do this).