Not too long ago, my boyfriend bought a "cold brew" coffee system. You can read about it online: http://www.toddycafe.com/
Basically, you buy a pound of coffee at a time, soak the grounds, then strain the "coffee concentrate" into a pitcher which you keep in the refrigerator. Through the soaking process, the acids that are hard on your stomach have been removed. Whenever you want coffee, you pour a small amount from the concentrate into a mug, then just add hot water. The coffee flavor is a little different, not nearly as bitter, so it took me a little while to get used to, but I definitely notice how much smoother and easier it is on my system.