He tells us to save money, but he preaches water and drinks wine.
preach water and drink wine
idiomTo act hypocritically; to fail to practice what one preaches.
The politician promised to cut government spending, yet he continues to preach water and drink wine by approving expensive new projects.
While the professor publicly condemns the influence of corporate wealth on academia, his private consulting contracts suggest he preaches water and drinks wine.
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blood in the water
In a competitive situation, the exhibition of apparent weakness or vulnerability by one party, especially when this leads to a feeling of vulnerability or greater pressure to perform on the part of the weak party, or enhanced expectation of victory by the others.
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blood is thicker than water
Family relations and loyalties are stronger than relationships with people who are not family members.
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blow out of the water
To trounce; to defeat thoroughly, as at a game or in battle.
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carbonated water
Water that contains carbon dioxide dissolved in it under pressure and is intended for drinking.
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carry someone's water
To do someone's bidding; to serve someone's interests.
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carry water for
To perform menial tasks for; to serve; to assist; to be forced by politics or pragmatism to endorse or promote a belief, individual, or organization that in reality one does not fully support.
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Chinese water torture
Any repeated irritation that builds to deliver cumulative damage.
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chum in the water
Synonym of blood in the water.