A friend of mine started a new internet based service that may interest all of us who don't like to carry cartons of mineral water.
It's called EauKLulen Online, it's at
http://www.eaukulenonline.com
They send directly to your address any number of cartons of mineral water (Eau Kulen only) of any capacity (1,5l, 50cl or 33cl).
Their site can detect your mobile phone and adapt accordingly.
I tried it Friday, they called me before sending the 2 cartons (18 kg in all!). The delivery boy didn't speak much English, but he had my invoice in hand and was smiling. All went well.
They also have a shop directly in their Facebook page: https://www.facebook.com/eaukulenonline/app_251458316228
Give it a try, it's new and it does work according to what they claim: not so often in Phnom-Penh!