If you have a winemaking shop nearby you should be able to find 25% Phosphoric Acid, it's used for wine lab work. Having it shipped usually involves Hazmat fees that make it quite expensive.
Something is always fermenting....
"It's Bahl Hornin'"
Kegged: Sour Saison, Pale Ale, Aggie Ale, Firestone DBA, De Koninck Blonde
Bottled: Belgian Quad (Grand Reserve), Derangement (Belgian Dark Strong)
On Deck: Pliny the Younger