Fresh Harvest Wine Kit

My wife is interested in getting the Master Vinter Fresh Harvest wine kit. She has some questions regarding the amount of fruit needed.

How much fruit is needed per 1Gal batch? How many bottles of wine can she make in one batch?

The kit comes with enough supplies to make 15 1Gal batches, can she buy more supplies when she runs out or does she need to purchase another kit?

Thanks,
Knucklesandwich