I can also make gravy. I sort of cheat though by using a seasoning packet that gets added to my pan drippings, the water from my boiled giblets, and however much vegetable water I need to reach the required 4-6 cups of liquid.
My mom used to make hers the same way, but with Bisto and cornstarch. The packet I use is essentially the same as Bisto, but the thickener is already included.
My mother-in-law was a wonderful cook, but her gravy was abysmal! Mike still gets mad when I call it brown wallpaper paste. Snap out of it, babe - she used pan drippings, vegetable water, flour to thicken, and instant coffee crystals to give it colour. And maybe salt, although I could never taste it. Beef gravy, turkey gravy, chicken gravy … same process, same wallpaper paste. Abysmal!