Assuming you want a stationary unit? Alexapure, it filters out the same stuff as the Berkey, but additionally filters out fluoride without the need of a separate add-on (which if you get also makes the Berkey more expensive per unit), and if both are loaded out with the max number of filters the Alexapure lasts 2x as long before needing a replacement.
They have a backpacking straw too but it isn't on Amazon, but on their own website:
https://mypatriotsupply.com/collections/water-filtration.
If you want to buy both then buy it from the site just listed and you will have paid enough for free shipping and the shipping is pretty quick. This site will also have chemicals for pre-treating (both tablet and liquid based ones).