"Water is for water' is only about the wet dream."
Jami` at-Tirmidhi Book 1, Hadith 112
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a similar narration (as Hadith no. 110) from, Az-Zuhri, with this chain.
Jami` at-Tirmidhi Book 1, Hadith 111 Next Hadith → "The Prophet was asked about a man who finds wetness and he does not remember having a wet dream. So he said: 'He is to perform Ghusl. And (he was asked) about a man who had a wet dream but does not find any wetness, so he said: 'No Ghusl is required of him.' Umm Salamah said: 'O Messenger of Allah! Is the woman required to perform Ghusl if she sees that?' He replied: 'Yes. Indeed women are the partners of men.'"
Jami` at-Tirmidhi Book 1, Hadith 113
Jami` at-Tirmidhi Book 1, Hadith 111 Next Hadith → "The Prophet was asked about a man who finds wetness and he does not remember having a wet dream. So he said: 'He is to perform Ghusl. And (he was asked) about a man who had a wet dream but does not find any wetness, so he said: 'No Ghusl is required of him.' Umm Salamah said: 'O Messenger of Allah! Is the woman required to perform Ghusl if she sees that?' He replied: 'Yes. Indeed women are the partners of men.'"
Jami` at-Tirmidhi Book 1, Hadith 113