what's your tolerance for error and do you really mean just "a few minutes"? a big quantity of water takes a long time to warm up because the specific heat of water is high. so if you want a bath at 10 deg C, get yourself a big (insulated if possible) container of water and a thermometer, and cool the water to just below the desired temperature with some ice cubes. it should stay around that temperature for a few minutes. if it starts to get too warm, add another ice cube or two. More water is better here, to increase the thermal mass. the temperature of the bath with change more slowly.