Twice now I've bought camel colored yarn only to discover that I don't really like the color. So instead of leaving it in my stash to collect dust I decided to have a go at Kool Aid dyeing.
There are a lot of how-to's out there for dyeing yarn with Kool Aid. I chose to use the instructions from thepiper.com. She has a color chart to help you choose which flavor to use. And it shows both white and natural tan color (very similar to the camel I was starting out with).
I used the Blasts Berry Cherry flavor. It was the only Kool Aid that wasn't presweetened that I could find. Luckily I wanted red :) Of course you don't have to use Kool Aid brand, you're free to use any brand of drink mix. Just make sure you get the unsweetened kind, you don't want sticky yarn. From what I saw in the store the stuff in tubs all has some sort of sweetner, so look for the packets.
There are other recipes that don't use vinegar. But I was afraid that if I didn't use the vinegar to set the dye that it would bleed.
The heat helps the fibers to open up and suck in all the dye.
It takes a while for the water to cool down. But don't try to rinse your yarn in cold water to get it cooled down, it'll cause it to felt.