Final Fantasy VII Tips

Lots of Items (may take a while)
If you're willing to put in the time, this can be very helpful

find a good shop and inn.
walk to the nearest area where enemies appear, and fight enemies until you have a comfortable amount of gil.
buy as many items as possible, heal, and go back outside.
do not use any items, use only restore materia and the inn.
try to buy 99 potions and Hi-Potions first.
eventually you will have plenty of items.
this is probably the most helpful inside, and before the temple of the ancients.
i used this inside the temple, since you can heal your party for free.