Sub-Metering Water

[Sovannary O.]

I am interested in purchasing a property but the owner pays for water so this could be a deal breaker because could loose money if I am paying water every other month. Does anyone know how sub-meter works if the property is currently occupied with tenants(are there laws against that)? Can anyone recommend a sub-metering company? I think in one of the podcasts @brandonatbp discovered he could sub-meter his water  - - does anyone recall which podcast number this was?

Thank you in advance for your recommendations!