This is a great hands-on activity for kids old enough to operate a funnel, as you'll probably want help filling all those straws. Keep them occupied and entertained making their own portable summer treats!
Step 1: Tools & Ingredients
60g dextrose1 (I got mine cheaply from Amazon)
3g citric acid (I got mine at the local yuppie grocery, but it's also cheap and easily available online)
10g freeze-dried fruits of your choice (I picked strawberries & blueberries up at Trader Joe's, and cherries at Whole Foods)
scale (especially if you're doing small quantities)
spice grinder (clean coffee grinder or mini food processor)
straws (brightly-colored paper straws look awesome, and hold about 1g powder)
paper funnel & poking stick
1I used dextrose because this is the same sugar used in commercial pixie stix, but you can also substitute table sugar (sucrose). However, since table sugar is generally estimated to be 1.5-2x as sweet as dextrose, you'll have to use 30-40g of table sugar in place of the dextrose in the recipe above, and it may never taste quite "right". I'll run the test myself soon, and update the Instructable with suitable quantities, but in the meantime taste and modify as needed.
Step 2: Grind fruit
Weigh out your freeze-dried fruit, then grind it in your spice grinder. (Or grind a bunch, then weigh out 5g.) If you're going low-tech, a mortar and pestle would work too.
If you want to be super-careful, use a sifter to remove any remaining chunks when you're done. I didn't bother, and thought everything tasted great.
Step 3: Add sugar and citric acid
Weigh out the dextrose and citric acid, and add them to your powdered fruit. It's fine to mix them directly in your food processor or grinder with the fruit, as this will ensure an even distribution. Otherwise mix thoroughly with a fork or whisk.