Can you fix a meatloaf after it's cooked too dry?

You could either double what you are making, which with certain things you can't or you can start over that's basically it.

depends on the type of the dish

if it is soup you can take a piece of clean cloth, wrap a handful of washed raw rice in it, put into your soup and let it boil for 15-20 minutes. Than you can remove it. Rice will take excess salt

if its meat you should stew it with salt-free sour cream sauce