So i need to make a mash tun becuase im sick of using home depot strainer bags. I bought the valve and strainer rod, but i need to know what vessel to get. My friend uses a 10 gallon cooler which works well, but i figure if your mash temp is not right, it's much harder to fix it easily since i can't put a cooler on a burner. I also have my brew kettle which can be converted into a mash tun. That would make it easier to correct temp i suppose because it can be on a burner. Which choice is best? cooler or brew kettle?