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Dont cut a bottle in half. Thats a useful container you have just made useless.
Use birch bark, a plastic sheet, or anything you can make a cone or funnel shape out of, and add your filter layers to that. The more you can repeat sets of layers, the better.
In 99% of real world situations you would need to do something like this, boiling is not optional. If you have no way of boiling the water, leave it in the bottle in full sun for 6-8 hours to purify. Longer if cloudy.
Use the intact bottle to store the purified water and drink from.