So, I hadn't had coffee for a long time. Plus, I was feeling a little sleepy in the morning so I decided to have a glass of coffee. It tasted a little different than the last time I had it, but I thought maybe I just forgot the taste or the amount of sugar was not same.
Right now, I was just taking a look at the small coffee jar and found out that the best before date had gone by in December 2017 xD. Worried, I opened it, and it didn't smell bad. It was a somewhat pleasant smell. Plus, it was mostly powder - not many lumps. Also, it was stored in a corner of the kitchen (not too hot temp, not too cold) in its airtight jar (so there was no moisture in it).
My question is: How long can the coffee remain fresh in such conditions? I would happily throw it away and buy a new pack, but I wanted to know just out of curiosity.
Side question: The jar also said that the coffee (plus some sugar) could be had with water. Does coffee taste good with water?
PS: I was confused whether to ask this on health stack exchange or here - please don't roast me if it's the wrong website. ;P