Get Vietnamese coffee and you will find you can keep it hot in the pot for a couple of hours and it is still good coffee due to its very low acid content. It is the acid that causes Folgers or Maxwell House to become undrinkable if the pot has been on for more than a few minutes. You can get it from gourmet suppliers or you can get it for $1 for 6 ounces at the Dollar Tree. Brand is irrelevant. Expensive or cheap it is simply the best coffee you can get.
I did a lot of taste testing a few of years back, actually when Maryland Club or Maxwell House (can’t remember which) switched from Arabica to Robusta coffee, (many mainstream supermarket brands all did) and found out that robusta is crap, and most Arabica is good. If the brand that you drink is non-specific, it’s almost guaranteed to be robusta, because the manufacturers know that Arabica helps sell the product. I also just recently found a very good Colombian Coffee, Arabica, from Costco (Kirkland) that is great and costs $8.99. That is for three real pounds. It is roasted by Starbucks. It is also available on Amazon for $16.00.
http://www.purelycoffeebeans.com/kirkland-coffee.html
I have no financial interest in Costco or the Amazon sellers, or the above website.