I've been indulging in Java since adolescence and thus I never had to acquire a taste for it. Bear in mind that back then Starbucks and other coffee house clones either didn't exist or were still in their infancy, so the main sources of coffee were either home brew, restaurants or gas station/convenience stores and there was not the prevalence of sugar and fat-laden frou-frou "coffee drinks" or other exotic concoctions like lattes and cappuccinos. Coffee was coffee.
While at home I mostly consume the common, less pretentious brews like Folger's or Maxwell House (usually in a Columbian roast), I've both enjoyed and endured many other kinds. As long as it's fresh and has a distinct coffee flavor and aroma and is not a generic store brand. I've found the best away-from-home choices have been McDonald's and Dunkin and the taste is usually consistent. Despite it's popularity and hype, I've found Starbucks one of the worst; their regular plain old coffee tasting like burnt and stale overpriced yuppie swill.
Instant coffee is pretty much the antichrist of coffee, but there were times I had no choice, such as living in the desert or having to rely on the packs in MREs. I admit I still keep individual packs around to be used as an emergency measure usually when I want another cup but don't want to brew a new pot. But their use is very rare.
The only thing I can say that has changed in relation to my taste with coffee is in what I add to it. For the longest time I was strictly a sugar and half & half drinker, adding in flavored creamers when they become more widely popular. Occasionally I could and would drink coffee with just the sugar, but it had to be exceptional tasteful and fresh. Later on when I became more health conscience I switched the sugar for artificial sweeteners; mostly Splenda. Nowadays I've pretty much cut that out as well and now drink coffee with just the creamer. I've never been able to stomach plain black coffee no matter how fresh, although at times, such as the aforementioned being in the field or overseas, I had little choice and the need for caffeine overrode my palate.
I will also say it is one of the only things that has gone beyond the issue of taste into more of a necessity. Coffee is my only vice and despite any debate, addiction and withdraw is real. I've only gotten the monkey temporarily off my back a few times either as an experiment or when I had no choice, but anybody who wasn't around me during those times should very, very grateful
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