I hear ya, if I'm gonna poison myself, I prefer Coffee or alcohol to Soda Pop. Have you checked out the recipes for Iced Coffee? You should only do Iced coffee with Kavain type Kavas. Make extra coffee in the morning. Put some condensed milk in it while it is hot. Optionally, add cocoa powder or chocolate syrup. Mix it well while it is hot. Maybe let it boil down a bit for concentration. Put in the fridge. In the afternoon, pour some coffee, add instant/micronized, stir, and add ice. Keep a spoon nearby because you always have to stir Kava drinks.
Another idea that works, add the instant to a bit of warm milk to mix it well. Then add the cold coffee and ice. Some say the milk will help with absorption. I drink my coffee black in the morning but if you are going to add ice, then you can add anything else you please.