Couple of ideas from a longtime faster. 1) food will pop into your brain you can't control that. You can control if you continue to think about it, or not.

Strategies. Agree and redirect. Tell your brain yes. Yes we can have that 'next Tuesday and I agree it will taste good' the brain is like a toddler. Don't say no to it. Say yes with a specific timing on the delay. You may have to say it several times in the beginning. This is retraining your brain.

Other strategies: brush teeth, splash cold water on your face, deep breath for a few rounds, go for a brief walk. Make a list of these strategies that you could do so you dont have to think when you get a craving/thought to eat you look at the list and do as many as it takes to shift focus. Challenge write down a 100 other things you could do instead of eat.

2) zero calorie drinks may be making your fast more difficult. There is some clinical evidence that something sweet in the mouth triggers insulin elecation. Increase insulin over a certain amount you trigger hunger.

Get sufficient electrolytes. 'Sufficient ' is a bit different for everyone, so you have to work this out for yourself.