I buy Sta-Flo liquid starch at my grocery store in quarts and half gallon bottles. Then I just dilute it with water in a spray bottle. Sometimes 50/50 water/starch and sometimes just straight. Half gallon lasts a long time. It's best if you rinse the sprayer after each session of spraying (like a week or more between times) because it has a tendency to stop up. I don't like the pressurized cans of starch because they always seem to stop spraying when the can is only half empty. I've seen Sta-Flo in WalMart too.