LMT, if you are using 300g of water, put 200g of water out of the cold tap, in a container and add 100g of boiling water from the kettle. This should give you warm water . Mix the dry yeast with the flour so that if the water is a bit warm you will not kill the yeast with the heat. The temperature of the flour will moderate the warmth of the water. I always dip my finger in the water to see that it is just warm, like a baby's bottle. Hope this helps.