A Battery Powered Cappuccino Maker?!
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The problem is that it requires a lot of energy to heat water to the correct temp (even many electric coffee makers can't do it. You'd probably need a car battery to power it.
There are plenty of small electric one/two-cup coffee makers. You could also make or buy cold brewed coffee. It's a concentrate made by steeping coffee grounds in cold water for about 16 hours. You could bring a little with you every day & just add hot water from a cooler or kettle for delicious 'instant' coffee.
If you do have access to hot water, a french press would also work well.
I roast my own beans and have seven ways to brew coffee.