I can’t be of any assistance, sorry. I really just want to subscribe to the thread in the hopes that someone will post a great book on the topic and I’ll notice.
A couple of months ago I began fasting for the spiritual welfare of my child. I go to adoration in the morning directing my prayer for the benefit of my daughter and those in most need of His Mercy. I ask for His grace that I may successfully fast AND that He will look favorably upon my sacrifice and petition. Then I fast the rest of the day until the evening meal that we have as a family. I do this one day/week and have considered doing it a second day for another petition.
Every time I fix a meal for someone else during that part of the day, I repeat my petition and offering. Every time my tummy grumbles, I repeat. Every time I start trying to play tricks on my own mind by justifying why I really should be eating, I repeat. repeat . . . repeat . . . repeat . . .
I would really like a good book on the subject b/c I too wonder if I’m doing it rightly and would like some guidance.