Hey all. I am brewing today, but unfortunately had an unexpected COLD night here in VA. Long story short, my outside lines are frozen and I need to go buy distilled water at the grocery store. I usually filter my water. I'm wondering if anyone out there can tell me what water salt/chemical additions I'm gonna need to add to the distilled water to brew a big stout/porter. I plan on having 7gallons in the mash(6 above the false bottom), and 7 gallons in the HLT. If anyone can help me out STAT, it would be greatly appreciated!