[m3yn86d]

Originally Posted by Peer

As far as I know the tap water in Spain is very chlorinated so I would not advise that but mineral water (without gas) will do fine.
Eventually you can sterilize it by cooking.
But you don' need too big a supply so just take mineral water without bubbles and you'll be fine.
Otherwise you should be able to get demineralized in a car shop because it is also used for car batteries and in steam-irons.
It's all the same.

I came across some water for irons and batteries and it said definaltely not for human consumption so I put it back but thanks for your advice anyway.
Another question. When the citric acid solution is made, how long does it last for?