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Jem, it says in the instruction book ... you can't use anything except distilled water. It also says that you will invalidate the guarantee if you use anything else other than water. It actually says not to use perfumed water or essential oils. :o(
It's good to know that someone else does, though, with no problems. Does your sil have a steam generator ... the one with a separate tank? Or a steam iron, with the tank inside the iron?
I had an Elnapress and I liked it, but when it developed a fault my sister persuaded me to buy a steam generator. I did have a bit of a problem lifting the Elnapress ... it was quite heavy. The vap-o-jet took perfumed water with no problems, and I do miss that part of it.