Distilled water and wipes

[Clay L]

Note that filters will not remove minerals from water. They will remove sediment and in the case of charcoal filters used in many refrigerators, chlorine and some sediment.
Based on what I have read, Reverse Osmosis removes minerals from water so RO water sold in the states in grocery stores- don't know about the UK - should be a reasonable substitute for distilled water.

[Sleeprider]

Note that filters will not remove minerals from water. They will remove sediment and in the case of charcoal filters used in many refrigerators, chlorine and some sediment.
Based on what I have read, Reverse Osmosis removes minerals from water so RO water sold in the states in grocery stores- don't know about the UK - should be a reasonable substitute for distilled water.

There are water purifying pitchers that incorporate R.O.   That is why I suggested the search criteria above.  They are a bit slow, but work okay.

[Melman]

Distilled or RO filtered water is the best way to avoid mineral deposits, but using tap water and simply draining the reservoir daily and replacing with fresh water may, in most cases, prevent mineral deposits. I have very hard well water. I have experimented recently with using it instead of distilled water. I find that if I just top off the reservoir daily I begin to see a trace of sediment after about three days. If I completely drain and replace the water daily, without any other cleaning, I see no sediment in 10 days, which is the longest I have gone recently. My humidifier setting is 5 and the water level decreases by between 1/2 and 2/3 each night. It appears that the concentration of minerals does not reach the saturation point and precipitate if the water is completely replaced daily.

Boiling tap water will not prevent mineral deposits. As the water evaporates the mineral concentration will increase making deposits more likely. It will kill most bacteria but they are not a risk if water meets drinking water standards.