I buy it by the gallon and make up the Mod Podge recipe as I need it in a mason jar. Just add half water, half Elmer's glue, replace the lid, shake it up and you’re ready to go. rate of dilution is Glue, water.
Easier, cheaper alcohol inks and dyes - use a cheap small spray bottle - mix KoolAid or food color or easter dye or RIT dye with rubbing alcohol. Intensity of color depends on amount of your preferred additive. I tried it and it works.