Thanks for the input!
Originally Posted by shivalotus
Have you considered steeping your dark grains separately and mashing the rest?
I have, but I'm going to save that for another batch. I really just want to get my AG process and limitations down without fussing too much with the beer. I'm also new to fermenting in a corny and working my draught setup, so I'm going to leave the fine tuning to another brew. I simply wanted to make sure I wasn't wading into disaster by neglecting the water and I'm taking too long to make up my mind =)
I'm going to go ahead and brew the stout, adjusting the PH of the mash with Calcium Chloride and Calcium Carbonate if necessary, and maybe adding some Calcium Chloride to the kettle if not in the mash.
Thanks again, everyone.