I see no difference whatsoever between religious fasting and non-religious fasting (intermitent fasting) - except for the motivation and chosen rulesets.
There are as many different fasting systems across different religions as there are fasting systems outside religion and a lot of fasters do so in far more extreme ways than Ramadan requires.
Everyone just adapts, as appropriate, and a lot of the traditions borrow from each other.
As far as I can see, any breakfast that you would normally eat and find appetising would do for the morning meds, and then a meal in the evening with the rest of the family. Although every Metformin patient info sheet I have seen has specified that the drug should not be taken when fasting.
So you have a choice - you can skip food and skip the tablet, or eat and take the tablet.
I have often gone 15 hours without a drink (through absent minded forgetting to fetch one), so a few hours longer would only be a problem for me if I was in a hot climate and getting dehydrated.
As for type 2 fasting, we have members on the forum who fast from 16 hours a day up to several weeks at a time, so there is a great deal of experience around, if you want to draw on that.