I just listened to your 2 latest tales from the road and I thought you might like my idea for coffee guaranteed to be consistent anywhere, or at least as part of your emergency supplies. Space Coffee - yes, the brands they have been drinking in space for coffee for the last 50 plus years in the various options (black, with cream, with sugar and cream with sugar) Except they have had to settle with it only at about 120°F.
If you have one of those cigarette lighter water heaters, bring the water to just short of about 180°F and it will mix perfectly.