If You Had A Twin, But Didn't Realise...
Family Life12 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.Rather than adding water to the buttercream, keep a cup of hot water next to you and dip the knife in the water then wipe it dry. The heat will soften the buttercream enough to spread it, but not water it down. You should be able to do several at a time before needing to re-dunk the knife.
Hope this helps.