"Ceremonial First Flush" at a Church Dedication?

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Just found out that it looks like we'll have water (and toilet) by the time our church dedication takes place on October 17th.  All along I've (only somewhat jokingly) stated that we should have a "Ceremonial First Flush" since our church hasn't had running water for any of its 59 years and having a flush toilet will be a big plus for parents who are potty-training their kids or those of us that find ourselves in the church for long periods of time.


Anyone have any ideas on how this could work liturgically?

Any Scripture references?

Any prayers?

(Don't suggest baptisms.  I think there are limits to how far we want to go here.)