I do - it depends on the quality of the water and the surface it's coming off. If you're catching it off a roof it may have paints & mouldproofing etc and in a built up area it could also include dust from pollutants. If it's water that's drinkable it'd be fine.
When raising axolotls I found they were extremely sensitive to treated tap water so I believe RAIN water is great!! I now have a rain butt, and all is good becausec its there if i need it!
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