Hello, can’t help you on the porridge calorie question, but you MUST keep hydrated on Fast days – plenty of fluids to make up for the water content of the food you are not eating, and the drinks you would normally have.

If you can make do with water that is great, next best are calorie free drinks like herb teas, green tea, black coffee. Some people refuse to go without milk or cream in their tea and coffee if you go that route you must include these in your calorie allowance for the day. People also recommend having one slightly salty drink such as oxo or miso so that you don’t flush too much salts out of your system.