dissolve in cold water, ONLY THEN add hot water. The rationale behind it is that aromatics evaporate too quickly when the instant powder is infused with too/boiling hot water.
Life is sad, and there are fewer options, when you drink decaf. It's all I can get at work, while the big, sophiscated coffee machine, with all it's flashy buttons, is dedicated to grinding life giving caffeinated beans to the masses.