I use a cheap stock pot. I'll fill it about 3/4's full of sugar, add very hot tap water and keep adding until the pot is almost full. I stir the mix some with a large wooden spoon and then put it on the stove and heat the mix until good and warm (but below boiling) and stir the last of the sugar into the liquid. It is not an exact mix, but makes around 4 gallons of a thick sugar syrup. When it cools, I store it in 1 gallon glass pickle jars and thin it to around 1:1 if needed at that ratio. I read somewhere, maybe on this forum, that adding 1TBS of apple cider vinegar per gallon slows mold build up. I have been doing this and it works well for me. The syrup smells a bit funky, but the bees take it, and the half gallon I have had sitting around as 2:1 in my kitchen has been there 3 weeks with no mold. Once it is thinned to 1:1 it needs to be used or refrigerated.