I am looking for distilled water while traveling for neti pot usage so it has to be distilled. I am staying at The Mercure City Centre which used to be The Leopold. Can anyone suggest a place to purchase?
You may be able to find it in the supermarket though it will likely be in the aisle with washing and cleaning supplies and not near the drinking water section. Some pharmacies may carry it also.
https://community.ricksteves.com/travel-forum/packing/cpap-machine-distilled-water
There is a supermarket in the mall almost (?) connected to the Hilton/Groenplaats. Be careful not to buy Lavender Steam Iron water.
I don't know your area, but ask a pharmacy to see if they sell distilled water or deionized water for CPAP machines.
You might be better off boiling tap water and then letting it cool. I have never been successful finding distilled water in Europe. (Actually, once I found a 0.5-L container for like 8 euros in an Apotheke.)
Another idea that may work for you is to buy saline nasal solution in a pressurized can and available at pharmacies. Not as good as a neti pot but better than nothing or trying to boil water in your hotel room.