Full Idea
If water is essentially H2O, this is going to have something to do with our intentions in using 'water'.
Gist of Idea
That water is essentially H2O in some way concerns how we use 'water'
Source
Alan Sidelle (Necessity, Essence and Individuation [1989], Ch.1)
Book Reference
Sidelle,Alan: 'Necessity, Essence and Individuation' [Cornell 1989], p.14
A Reaction
This very simple point looks to be correct, and raises very important questions about the whole Twin Earth thing. When new discoveries are made, words shift their meanings. We're not quite sure what 'jade' means any more.