Mix one package of unsweetened Kool-Aid and 1 ounce of vinegar. Soak a piece of fabric in the dye for about 15 minutes. Remove the fabric and allow it to dry. To set the dye, iron the fabric with a cotton cloth or ironing rag between the dyed fabric and the iron. Experiment with different flavors; each flavor will result in a slightly different color.
Dye a variety of fabrics. Examples of fabrics that can be dyed include cotton, wool, silk, nylon, burlap and cheesecloth. The fabric samples you choose to dye should be plain, without a pattern, and all fabric samples should be as close to the same starting color as possible. Take note of which fabrics pick up the dye most effectively.
Dye four to six different samples of the same type of fabric the same color. Set the dye and allow the fabric to dry. Wash each fabric using a different detergent or cleaning solution and take note of which detergents preserve and dye and which detergents fade or wash away the dye. Examples of detergents include laundry soap, dish soap, hand-washing soap, vinegar and bleach.
Twist the fabric you intend to dye until it begins to form knots. Wrap rubber bands around the knots. Dye each knot a separate color and allow the fabric to dry. Dye the fabric a second time using different dye colors and allow the fabric to dry. Remove the rubber bands and untwist the fabric. Examine the pattern of dye on the fabric. Use the data to predict the pattern of dye on additional projects. Experiment with different methods of twisting the fabric and observe the results.