Black. French pressed as the most affordable bang for your buck.
I also like it with the cream warmed by the machine if the coffee sucks.
Usually black. Sometimes coconut oil, sometimes sugar. It just depends on what kind of mood I'm in.
My nutrition/fitness/critical thinking blog:
The downside is that cold brewing coffee takes about 13 hours from start to finish, fortunately, it requires no monitoring, and you wind up with coffee that's less acidic and suitable for consumption instantly once it's brewed.
I only recently started drinking coffee (made it through most of grad school before caving in, believe it or not). I don't have a coffee maker so I brew about 16 oz from a handful of beans ground and steeped in a fine mesh tea strainer for 3-4 minutes--I have no idea if this produces similar coffee to the traditional kind, but it seems to work. I add about 2 oz of canned coconut milk, a drizzle of wildflower honey, and often a teaspoon of cocoa powder or a dash of cinnamon. Yum!