The first issue with this narration is that Abdullah ibn al-Mughira attributes it to "some of the truthful ones." It is possible that the person he referred to was not an Imam, even if he believed them to be truthful based on outward appearances. Therefore, acting upon it is not obligatory. Secondly, there is consensus among the Shi'a community (‘assaba) that it is impermissible to perform Wudu' with nabidh, which also invalidates using this narration as evidence. Even if these objections were overlooked, the narration could be understood to refer to water made pleasant with a few dates steeped in it, particularly if the water was bitter, provided this mixture does not alter the substance such that it no longer qualifies as "water." In linguistic terms, nabidh refers to any substance steeped in a liquid. Thus, bitter water with a few dates added could be called nabidh. This interpretation aligns with the language and context.
Commentary #6