I used to use acid in my tap water for sparge water to get the pH down to 6. I have since gone to 90% distilled and 10% tap with no acid for sparging and the final runnings pH is always well under 5.8 as long as my mash pH was good. At first I used an eye-dropper (from Walgreens) to add the acid and then went with a burette for more accuracy.
FYI, 17 drops from a Walgreens eye dropper is about 1 mL, measured with the burette.
Next: No idea
Fermenting: Oktoberfestbier, Kolsch, Homegrown Hop IPA 2015, Doppelbock, Egregious-ish, Barrel Fermented Dreg DelcoLambic, Sacch Trois Helles
Drinking: Oat & Conan DIPA, RIS, Carrot Blossom Cedar Mead, Dusseldorf Altbier, Cider, Rye Berliner Weisse, Sauerkraut Fermented Gose, Gueuze, Brett Blonde, Kriek, Saison, Sour Blonde
Barrel aged: RIS, Rye Barleywine, Tripel, Wee-Heavy