It appears that nothing between Weather2 and Tough as Nails interacts correctly at all. The rain doesn't give the player the "wet" modifier for their temperature and the rain collector doesn't seem to be able to collect any water.

Can we have compatibility between these mods? Thanks

I did a bit more intensive testing. I can confirm that the rain collector does actually collect water from the rain with Weather2. Still no wet modifier though.

Though, it doesn't seem that we can pump the purified water out of the rain collectors automatically... At least with Thermal Dynamics' fluiducts we can't... Can this be fixed?

Edit: Also, it seems that Forge doesn't correctly recognise the purified water bottles in the same way as other modded liquids in bottles. I can't empty purified water in the sink from Cooking For Blockheads, nor can I decant the purified water into a tank for storage.