You have to look at pure blends that come from certain regions. I drink the Costco stuff, but I am not an expert. I think that could be your problem, in that their blend is more acidic. I think cold-brewed coffee is also less-acidic.
Mixing in a bit of milk or cream helps buffer the acidity a bit. Also, some sources indicate decaf coffee is more likely to cause stomach upset than regular coffee.
Alton Brown did a whole half-hour on coffee several years ago: Your approach probably did exactly the opposite of your intention. The fewer grounds you use, the more each bit has to give up to the drink; the first draw from grounds is mostly the flavor; the bitterness (and I guess the acidity too - Brown didn't mention it specifically) comes later. So for a less caustic cup, use more grounds, not less.
I'm not sure if that's as true as it once was. We recently had to replace our Keurig with this year's model of the unit we purchased a few years ago. It is very clear that the process has been changed. Previously, you would press the brew button and the brewing happened immediately. Now, there is a delay of 8-10 seconds while something happens that sounds a lot like the water being quickly heated up. That makes we wonder if the newer units, cognizant of the concerns about energy vampiracy, aim to keep the next 12 oz of water at a lower temperature than previous year models, and makes up for that by a short, boosting of the temperature just before brewing.
Yummy!
Wow. After finishing that page, I suddenly realised that it's not a spoof.
)
