Is it safe to use rainwater as an ingredient versus tap water – or even cooking things in it like pasta? Would there be any differences in measurements or cooking times – the thought being that there are no chemicals in it versus Tap Water?
Is it safe to cook with rainwater
food-safetywater
Related Solutions
Some people say cold water boils faster than hot water, this is false, found here and here.
One reason might be (from the first link): "Some water heaters may introduce additional sediment into the water, giving you another reason to consider starting with cold—at least, if time is not of the essence."
I would recommend using Whiskey Stones. They are used in whiskey instead of ice cubes. So they should be heavy, won't rust, and are supposed to be immersed in liquid that you'll consume. I think that probably meets all your criteria.
Another alternative is to use a rack. This comes with the Sous Vide Supreme and I find it quite useful for keeping meat submerged. It does however only accommodate certain sizes of meat. It works quite well. You can buy it separately online for $12.
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Best Answer
Keep in mind that tap water is tested to ensure it's safe for human consumption. Rainwater has no such requirement.
While rainwater seems to be a happy-fuzzy natural resource, I'd like to stress that this could be a serious safety issue. Yes, it seems unlikely, but you need an authority who knows their water.
I suggest seeking out a professional opinion on how to properly filter rainwater. Possibly from the people who handle your municipal water supply.