For some reason I think of it as an older concept. Now Starbucks and coffee chains are popular.
Seinfeld on instant coffee https://youtu.be/uDrh5pujB9I?si=VdlVEREjMTNd2Bs7
Highlighting carlcook’s advice:
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.
Vacuum insulated hot drink containers are a thing, and work very well. That’s what field workers use. Who has time or a device to boil water?
Every coffee vending machine I have ever used ground the coffee while you wait. Cappuccino machines are definitely a mix, though.