since January 2014
20 Jan 20147:37 am
A quick thought about measuring soda without increasing the de-carbonation: You can use a kitchen scale.
Luckily 1 ml water weighs roughly 1 g (http://www.wolframalpha.com/input/?i=1ml+water), that is, 1 fl oz is roughly 30 g (http://www.wolframalpha.com/input/?i=1+fl+oz+water).
This can be used in two ways: Either to measure a specific amount of soda into the glass or to reverse-engineer how much soda goes into a glass given typical amounts of ingredients and ice. Once you are calibrated to the type of glass+ingredients+ice you don’t need the scale anymore (and know roughly how much soda went in).