I've been carrying some Mainstay Ration Bars ("lifeboat rations") in the get home bag I keep in my truck. I chose them instead of MREs because they are designed for long term storage in harsh environments. I've had them for a couple years and although still good, I wanted to replace them with fresher ones. So, earlier this month I got some more. Today I decided to try one.
Not bad at all. It has the consistency of a cookie and a lemony taste. I had some water along with the bar and didn't notice that it made me thirsty or if it had an aftertaste.
Assuming your not allergic to any of the ingredients, or don't have any special dietary restrictions, these are worth looking at for emergency rations.