I'm getting back into the hobby and I'm about to receive my first few plants in a few day. BUT my 3 year old son has opened the tap on the waterbutt that I've collected water for the plants and has emptied completely .No rain is in the forecast .
Where can I buy distilled water ?
Is it just bottled water?
Also could I collect water from my shed ? Or is it best to stay clear as the roof is covered with shed felt, wood it harm the plants?