In some mountain huts without tap water and only disconnected solar electricity you can't have espresso machines. You'll get filter coffee from melted snow. It's heartwarming, though.
I mean we don't really use espresso machines in Italy, we use moca's. Moca machines can run easily on a camp stove. Try it, you'll get better coffee from a camp stove than most espresso machines, promised!
Can you even tell the difference between arabica and robusto when the beans are roasted to taste like fire pit ash? That said, Americans are no strangers to overroasting our coffee just as we overhop our beer.
yes, easily. robusta tastes like burnt rubber asides from the charcoal that comes from over roasting the coffee, arabica is more neutral no matter what the roast level is.