Submerge skewers in water, coat them in sugar, and then set out to dry. I like to do this a day ahead of time, but as long as you let them dry for an hour, they should be fine.
Make sure your jars are clean and not cold (run hot water through them if necessary). Attach a clothespin or chip clip to the top of each skewer and then balance over the top of jars. Be sure your skewer is hanging about an inch from the bottom of the jar as the rock candy crystals will stick to the bottom of the jar and will make it tough to remove skewers.
In a large saucepan, bring water to a boil. Add sugar in one cup at a time, stirring with a wooden spoon and letting each cup fully dissolve before adding the next. You'll notice it becomes harder and harder for the sugar to dissolve as you add more in.
Once your final cup of sugar has been dissolved, let mixture simmer for about 5 minutes before removing from heat. Let mixture rest off the heat for about 15 minutes.
Divide sugar solution amongst the 5 prepared jars. Stir in food coloring at this time. I recommend bringing your jars to where they'll be resting for the next 6-7 days at this time. Be sure to use caution as the jars will be very hot. Once they're in their resting spots, place prepared skewers into solution. You'll want to try your best not to move jars around much once skewers are in place.
You'll likely see little crystals forming within hours, but you'll want to let the jars rest for 6-7 days to let sugar crystals fully form.
When ready to remove rock candy sticks from jars, use your finger or a fork to gently crack the hardened sugar on top of the jar and gently wiggle the stick to release. Let solution drizzle from stick (I recommend setting the candy over an empty jar or bowl to let it drip) before enjoying the candy.