RuneScape Classic Wiki
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The main RuneScape Wiki has an article on: Bad wine
The Old School RuneScape Wiki also has an article on Bad wine.

Bad wine is obtained when failing an attempt to make wine by using grapes on a jug of water at level 35 cooking. It becomes impossible to fail this process at level 70 cooking. The player will not receive cooking experience if the unfermented[sic] wine turns into bad wine. Bad wine could be considered a useless item if the player does not want to do the wine trick. Consuming the wine only has the negative effects of the good wine and empties the jug.

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