I have various flavors like Hawaiian punch and root beer as the powder you put in your water to make it taste better and it says they were best by last year (2023). Is it safe to use them? I've never even opened the boxes they came in.
They're sugar free for anyone wondering
Is it a "best by" date or a real "expires on" date?
Powders like this only go bad after being exposed to moisture. If properly sealed they will last decades.
It's best by date
You're probably fine so long as it doesn't have moisture!