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To distill water, you just need a hotter part and a cooler part. The hotter part needs to be 212 F but only IF your still is at atmospheric pressure. If you pull a partial vacuum then this number drops, which is pretty convenient if you're using solar.

Copper is really effective but I wouldn't get hung up on it. You want a whole house filter or RO, or just filter your water out the tap.

Bacteria is particulate so it gets stuck in the filter.

The only thing you can't easily filter is dissolved ions such as chlorine and fluoride. But an RO will (to around 80-90%)