Buy bulk cinnamon bark. Break off an inch and drop in hot liquid: coffee, tea, water, cocoa, etc. If you don’t use real milk, you can go on using it for hours and hours. It immediately sinks to the bottom and lies there exuding cinnamon-y goodness and it just gets quicker to flavor up. So you don’t need those pricey little specialty coffees. Just go straight to the source. You could probably do the same with a few cloves. Nutmegs are too large. But the basic principle of tea is something that will exude flavor into heated water, so in that sense coffee is a tea, and so is lemon or a single cinnamon stick in hot water.