Simply putting some pebbles in a dish with water is a decent solution, although you need to keep adding more water all the time so it won't dry out.
An electronic feeder might seem excessive, but with the right design it could be placed in very dry environments with a 1 gallon supply of water dispensed drop by drop ... and only when bees trigger it, lasting for weeks.
Could even run on solar power easy.
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@futurebird @pixouls wonder if it'd be enough to have a constant (slow) drip of droplets going down a little plate, with space on the sides for bees, and then a tiny solar powered pump to get droplets that weren't taken back to the reservoir
