Why do energy drinks only come with tabs and not caps? Do they expect the consumer to drink it in one gulp?

I've had my Keurig 2.0 for a couple years now, it's been working great until recently. What is happening is the part of the brewing cycle that extracts the last of the water from ...

So for apparently like 3 days I've been drinking sour milk in coffee(it was in boiling coffee so it obviously killed the most of the sourness) I feel alright but just like **** ins...