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1 gtt = 0.0028 fl-oz
1 fl-oz = 354.88 gtt
Definition of medical drops of water provided by Merriam-Webster
the smallest practical unit of liquid measure that varies in size according to the specific gravity and viscosity of the liquid and to the conditions under which it is formed.
Definition of US fluid ounce of water provided by WikiPedia
One US fluid ounce is 1⁄16 of a US pint, 1⁄32 of a US quart, and 1⁄128 of a US gallon. The teaspoon, tablespoon, and cup are defined in terms of a fluid ounce as 1⁄6, 1⁄2, and 8 fluid ounces. The fluid ounce derives its name originally from being the volume of one ounce avoirdupois of water, but in the US it is defined as 1⁄128 of a US gallon. Consequently, a fluid ounce of water weighs about 1.041 ounces avoirdupois.