Buttermilk
5.0Replace liquid with buttermilk and add baking powder; acid reactivates leavening
Drinks need baking soda to dissolve fully below 40F and suspend without gritty residue on the glass. A quarter-teaspoon in homemade soda drops pH 1 unit and cuts citric acid bite, but CO2 releases within 10 seconds of contact with lemon juice, so timing and mouthfeel matter more than rise. Subs are ranked on solubility in cold liquid and whether they leave the drink clear rather than cloudy after 60 seconds.
Replace liquid with buttermilk and add baking powder; acid reactivates leavening
Buttermilk as a drink base (lassi, shrubs) runs at pH 4.6 — opposite of soda's alkaline mouthfeel. Suspension is thick and tangy; solubility of added flavorings depends on casein micelles, which stay stable above 40F for roughly 2 hours before separating into a watery bottom layer.