Rosemary

I have had to buy a new iron and in the instructions it says not to use distilled water but to use a 50/50 mix of tap water and demineralised water. Anyone seen this in the shops? I have a Britax water filter so would this be classed as demineralised? For years in my old iron I have been using a water that says "destilada-desionizada-no ixidante-descalcificada-neutra" which I know is distilled water but I have never seen demineralized water and I am aware that they are not produced in the same way.

Rosemary