You should drink it throughout the day and do the most when you are home. I can't remember what I did, it is now 5 years ago, but I switched to water with apple cider vinegar (from the healthfood store). I can look up the amount, but I have to leave the house now.
If you don't get any answers in the meantime I will get back to you. For sure so much apple juice might give anybody a belly ache.

I started out at 2 tablespoons of ACV per 32 oz's of water.

I eventually settled on 1 tablespoon per 32 oz's., but drank 96 to 128 oz's a day.

Arnold

You should never drink 32 oz of anything too quickly. It is very stressful on the kidneys to have to deal with eliminating that much added fluid. For best results, all liquids should be slowly sipped throughout the day. Apple juice is cleansing, but I suspect that too much fluid too fast was your problem. What the body could not absorb went through the bowels and you wound up having to pee and pooh most of it out. Next time, please just sip all day long.