Or you could just... not make use of any of the extra options and enjoy the cheapest price possible.
I spent a total of 8 EUR to travel from Germany to Bulgaria and back again two years ago with Ryanair. I fly with them whenever possible because they're by far the cheapest option available and I simply manage to not eat or drink something or go online for 2-3 hours, which really should be manageable for pretty much anyone.
I did this in Hamburg (technically I bought a bottle, but I drank it before boarding, so I refilled it before flight). But in my limited experience, these fountains are not common in EU airports.
No. It's the willingness of manufacturers to make it possible.
We could have had this many years ago already. The technology was there, the performance was there, it's just that the willingness of phone manufacturers to enable users to do it was lacking and still is for the most part.
Probably because there's not that much demand for it either, outside of techie circles.