Ingredients of liquid used to keep diamond saw blades cool while cutting gemstones or glass beads?

its an add water mix and gets mouldy after a week or so,it also has a soapy(liquid) feel to it leading me to thing it may be glyceren.i buy this stuff and add water to it to cut glass beads on a diamond saw to keep it running cool,and to add life to the diamond wet saw blade.how can i make it myself?