Add oreos and salt to food processor and pulse until crumbs form
Turn food processor to its continuous setting and let run until mixture is becoming smooth
Add in oil one tablespoon at a time, processing in between each addition and then add in the butter, followed by the milk. Add in the water, if using
Scoop out of food processor and place into a sealed container
Mixture will stay in refrigerator, in sealed container for 10 days