Of course, but when all the H2 in all of the gas giants has been mined and fused, there will be ~500x more waiting in the sun.

99.86% of the solar systems mass is in the sun. Over 70% of that is hydrogen that could be used for fuel.

I can't imagine a Type II civilization ignoring such a massive resource. Even if they simply end up "mining" the sun for hydrogen that they use for fusion reactors elsewhere. If they are not taking full advantage of their star, I don't think they can even be considered a fully-fledged Type II

I mean humans used to just drink water from random wells, springs, and streams.

Distillation may not be perfect, but I'd argue it is more often overkill than insufficient in survival scenarios.

Maintaining a reverse osmosis system or getting access to chlorine/iodine to purify the water is a much harder and come with their own downsides too.

Not just boiling a pot, distilling the water. Heat it to a vapor, then capture it and condense it.

https://www.wikihow.com/Make-Distilled-Water

The first two setups are great if you have a stove or fire. Ice is not necessary, but will speed it up.

Personally, I would run rain-water through one of the first two setups, but it should be drinkable as is.

https://www.distilledwaterassociation.org/2018/08/08/how-to-make-distilled-water-easy-with-the-power-of-the-sun/

This can work too if you have no heat source, but will be much slower. It is essentially the 1st setup from WikiHow, but with tarps and the sun.

Honestly this is a pretty optimistic article as far as climate change goes.

It only really shows current conditions. Even best-case scenarios of climate change mean that the conditions they show will become more common in more places.

Water recycling can be done at home as long as you can boil water.

It can be done with just sunlight too if you have enough space and time.