Drinking Water Filtering Device

A drinking water filtering device filters drinking water being drunk from a beverage container. The device includes a housing having a peripheral wall defining an interior space. The housing has a bottom end and a top end, each of which is open. A filter is positioned in the interior space between the bottom end and the top end. A collar is coupled to and extends upwardly from the top end of the housing around the open end. The collar defines a socket configured for receiving an opening of a straw wherein the filter is configured for filtering water drawn through the interior space by sucking on the straw.