Sure, the milk is nutritious but there's not enough from a rabbit to be worth bothering with for a human. And milking rabbits would not be like milking cows. Cows, and even many goat and sheep, stand relatively still to be milked. Rabbits can't and won't and there's no good way to make them.
The theory that wine was discovered by accident is most likely correct because wine grapes contain all the necessary ingredients for wine, including pulp, juice, and seeds that possess all the acids, sugars, tannins, minerals, and vitamins that are found in wine.
When grape juice converts to wine, alcohol is produced in the fermentation process because yeast eats the sugar present in the juice. In many wines, the winemaker stops the fermentation process before the yeast has time to eat all the sugar, leaving the wine a touch sweet.