Given the background description of some cooking related query, summarize the question into a title

Example Input: My local supermarket was out of 1% milk today, so I decided to get half a gallon of 2% and half a gallon of skim milk and combine the two at home. Now I'm wondering in what I should store the combined milk...I still have a 1 gallon container from the last milk I purchased which I can use. There's a tiny bit of milk left in there, but it will be finished by today. The only thing I'm worried about is that, even if I wash the container the best I can, it will still have traces of bacteria in there from the old milk. Does this mean, then, that I should treat the expiration date of the combined milk as the same date printed on the old container?Should I store the milk in some other container (e.g. a pitcher)? Should I temporarily combine the two in a pitcher, then put them back in the two half gallon containers they came with? Any other ideas?
Example Output: Which container to use for combined milk?

Example Input: I use coconut milk for a pasta dishes, then put the carton back in the fridge. I may use some of it for a coffee additive, the use plenty more for another pasta dish or recipe. Alas, I do not cook at home all that often, and sometimes the stored coconut milk tastes bad, so I toss it and go to the store for a fresh carton.What is the shelf life, in a fridge, of coconut milk? Is it actually bad if it tastes bad, or could it still be used at least for some purposes? How to tell if it's about to go bad even if I can't smell anything out of line?
Example Output: Shelf life and Validation of Coconut Milk?

Example Input: I'm baking something that I might end up sending on a very long trip. For this I would want to make ganache, but it may be in transit for as long as 10 days so I don't want to use cream. If I do make these, the ganache would between sandwich cookies. What could I use for that, stable at varying temperatures, for as long as 10 days, possibly even longer?
Example Output:
Shelf Stable "Ganache"