There is no need for a chemistry degree, or precise measurements. Making this home remedy application fluid is not rocket science. In a spray bottle, fill with about 12 oz of plain tap water. Using a liquid soap, like hand soap, or liquid dish soap, add a few drops of soap into the water. About 4 to 6 drops should do just fine. You do not want it to be TOO soapy, so it does not foam, or have too many bubbles to contend with when smoothing out your decal. The fluid simply retards the decal adhesives to allow you to reposition the decal until it is aligned properly. Use liberally, spaying in a mist pattern from a spray bottle. Mixture may foam some, but try not to let it foam excessively. The less foam you have the less bubbles you will have to contend with when smoothing out your decal.