Glass water dispenser with large activated charcoal pieces. I used this to filter my water when I lived somewhere with sketchy tap water.
You put the charcoal pieces in the dispenser, add water, and wait for an hour. Once every week or two, hard boil the charcoal for 5 minutes to re-open the pores and allow it to absorb more. Replace the charcoal every 6-12 months depending on use volume.