Hello Rands!
Here's the manual for your use and reference on your Rival 18 quart roaster oven.
http://www.rivalproducts.com/manuals/MANUALS/RO188BR_43_81844057.PDF
According to the instructions, you should add about 5 - 6 quarts of water in the lower compartment.
Please download and print a copy of the manual for your use and future reference. I have made a file folder on my computer labeled "Home Appliances and Equipment" into which I save electronic copies of all my owner's manuals and guides, just in case they become unavailable from the internet in the future. That way, I'll always have a file from which I can review and print out a copy, if needed.
Enjoy your Thanksgiving and save me a drumstick! Hope you find this Very Helpful and best regards!
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