The 'pump bottle' concept is rather good, I thought. Generally speaking, it is convenient and means one can avoid having to rinse the plastic droppers between dosing traces, PO4 etc.
The White House has the same problem with emails these days, Jeff

Once upon a time, a private message was, in fact, private and one would not quote it without permission. But these days..... privacy is a thing of the past until someone does something to protect it again.
Andrew Cribb