Sparkling water for me.
Well, leaving instant coffee aside, I cannot consider Starbucks any sort of recommendation because their actual coffee is - to my palate - profoundly unpleasant, being thin, bitter, burnt, and sometimes, stale.
Yes, I suppose it is personal taste, and choices made re time management.
You have written that you are impatient.
I suppose that I am, too, (as I value time).
However, even on mornings where time matters, and deadlines must be met (such as occurred horribly early yesterday morning when I had a medical appointment for which I had waited a number of months), I will make the time to prepare a cup of coffee (filter paper and Hario dripper); okay, I did forego the accompanying hot milk, but coffee in the morning is a non-negotiable, and I also (all too vividly) remembered how perfectly awful the coffee was (is) in the hospital, and that I didn't fancy facing appointments, and possible delays, without the fortification supplied by a proper mug of real coffee.