The sawyer mini is a great lightweight filter which I take with me on all my hiking and bushcraft trips. You can also add a carbon filter for added protection.
Kit I use and recommend
The 550ml pot is light and strong, corrosion-resistant and lasts for years. Rounded bottom edges make cleaning easy and improves heating efficiency. Handles fold away for compact storage. Titanium leaves no metallic smell or taste. Perfect for one person.