It occurred to me yesterday when I was on the phone with Teri that a lot of people born in the last 25 years or so have not had mandatory cooking classes in middle school or high school, so I though I would write about improvising if you don't have the called for casserole dish.
To improvise a casserole pan is one of the easiest things to do. Most of you basic cooking sets will come with either a rectangular or square cake pan or a bread pan. And you should have aluminum foil as on of your kitchen basics.
Line your pan with the foil, shinny side down. added your ingredients and seal your pan with another layer of foil shinny side down. Make sure that your seal is very tight or you might run out of cooking liquids and end up with a very dry or burnt dish.
For metal pans you can use the the temperature called for in the recipe. For glass baking pans DO NOT put the oven temperature above 325 degrees Fahrenheit and give it a longer time to cook.
If you have any specific question on improvising just leave a note in the comment section and I will address the issue to the best of my abilities.
Have a wonderful day and enjoy your families.