While talking with your liberal friend, suddenly start sniffing the air, then brighten as if the light bulb has just gone off:
"Oh, reliving the old hippie days, were you? It's okay to shower, you know; water's a renewable resource; it comes from rain..."

Psalms 118:8 It is better to trust in the LORD than to put confidence in man.
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Scarlet Chord Ministries   Isa 1:18