Thank you Adaryn for that link given previously.On this site (already mentioned in this thread), you can get 1000 ml of hypertonic water for 20,90€ (you can make your own isotonic water by diluting it with mineral water: 1 part of hypertonic + 2 parts of mineral water). They ship worldwide. I enquired about the shipping costs: for 1 box of 6 bottles, the shipping costs are 36 € for Germany, 34 € for the UK and 62€ for the US.
They had a special this weekend. You bought 2 botltes and they gave you one, you bought 4 and they gave you 2. The shipping cost for Canada for 6 bottles was 64,50€