Electrolyte powder conversion - 5 gallons to 16 oz bottle of water

Question

Instructions on a 57 oz can of electrolyte powder says to dump it all into 5 gallons of water. I need to know how much powder to use for a 16 oz water bottle for a backpack trip.

Answer 1

There are 128 ounces in 1 gallon, So using a ratio

(57 oz of electrolyte)/(640 oz of water) = x electrolyte/(16 oz of water)

Solving for x we find that x = 1.425 oz of electrolyte