You're worried about the deliveries?! ;D That's actually the easiest to sort out, at least in the Netherlands. You just get it delivered to one of the delivery lockers.
More hassle is the water situation, but like I said you can work around these things if you have time and patience — and living off grid like this will allow for that.
EDIT: Now that I think about it, I suspect you're coming at this thinking of the land being in some baron backwater. We don't have the luxury of being able to live in the middle of nowhere here. Even "nowhere" is a few kilometres away from "somewhere".
I don't know about Europe, but in the United States there are private mail centers that you can use for both letters and package deliveries.
UPS Stores (a private company, not USPS, which is quasi-governmental) are one among several. They give you (what looks like) a normal street address, so Amazon or whoever has no way of telling.
