Water Purification in top up bucket

[freezetyle]

If one didnt have an RO machine. Aside from adding something like prime. do you think it would be beneficial to add carbon or something like zeolites to your top up bucket so the water is passively filtered by them? pretty expensive i guess in the long run, but if you had space restraints might be an idea

I have an RO machine but watching dragons den and having some people trying to sell zeolites as an all in one filter for the fridge water etc got me thinking if you could do this.