Anavar has a short half life so you should always split up your dosage into an AM and PM dosage. I would take your first dosage as soon as you wake up and your second dosage around 12 hours later.
I personally am not a fan of intermittent fasting. Look into carb cycling instead. It will be much easier to make strength gains while on a carb cycling diet, with much less risk of loosing muscle mass. Here is an article I wrote that explains how to set up a carb cycling diet:
http://www.evolutionary.org/cycling-carbohydrates