It doesn’t make sense to just buy these types of foods and place them in long term storage without ever trying them or experiment by using them in recipes. A disaster that requires you to depend on your stocks will probably happen without warning. That is no time to begin trying to prepare good tasting meals without knowing what you can do with them for the first time especially when you will be under stress.
Now in order to sample the contents of #10 cans they must be opened and immediately at that point the long term food life begins to degrade. There are 13 cups within a #10 can so if you have 6 or 8 different types of food that you need to practice preparing, a lot of time may pass during this practice time and spoilage of the remaining amount is likely.
I get around this problem by opening the cans and immediately transferring all the contents into one quart canning jars with an oxygen absorber in each jar. Now I can use one of the jars to take food from for my testing and everyday use while the rest is safely stored in an oxygen free jar to continue its long term storage.
There are 13 cups total volume in a #10 can, however that does not necessarily mean there is 13 cups of food in them due to settling/compacting during shipping. Check with your supplier to verify the actual amount of food inside so your planned amounts of meals in stock are accurate. You can also check the label/contents online for the weight of the contents, normally in pounds, the number of servings inside and the serving size. The serving size is normally in cups tablespoons, ¼ cup, ½ cup etc. but also includes the weight of each serving in grams. (There are 454 grams in one pound).