in a skillet on medium heat add the shortening, when melted take a fork and slowly start adding the flour making sure the flour is dissolved. you keep adding the flour until all flour is used.
Make sure there is no lumps of flour left.
In a bowl add one cup of milk and one cup of water, making sure water and milk is blended.
A little at a time start adding milk, and keep stirring the mixture should start looking doughy, this is normal.
As you keep adding the milk it should start slowly looking like gravy. Start adding your salt and pepper.
If you run out of the milk mixture add the second cup of milk and
water together. keep adding milk mixture until is as thin as you want it.
If you want thick gravy add at least 1 more cup of flour, before you start adding
the milk mixture, the more flour you add the thicker it will be.