that's a difficult question... usually, it's like... my dad has a capsule? pod? machine so i usually just use whatever capsules he has around, but i kind of cut coffee (and caffeine in general) due to anemia issues
when i used to buy iced coffee i'd get it from dunkin donuts. for me instant coffee's main use is... the powder is really good in desserts... 🤔 <--it may seem ridiculous, but my old hobby used to be baking