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# Add some dissolved sugar/vanilla/lactose (or whatever).
# Carbonate it light to reduce gushing.
# If selling to go, instead of expecting customers to "keep it cold", use the easy money to take some responsibility and buy a damn pasteurizer. Or at least add some potassium sorbate and metabisulfite (remember not to inform your customers that this thing contains sulfites until the TTB/FDA force you to do so) and hope for the best.
Video instructions for making these at home (no homebrewing required):