The Shulhan Aruch (310:1) establishes that any food which is edible on Shabbat is not Mukse, regardless of where it is stored. For example, if someone has food as merchandise in his store, he can open the store and take it for his personal consumption on Shabbat. This Halacha is in accordance with Rabbi Shimon, in the Gemara, who holds that even if one set aside food to not be used for a long time, it is not Mukse, if it is still edible. Therefore, even if the food was in storage for sale at a later date, it may be used on Shabbat. For example, a person may take a bottle of wine from his warehouse to drink on Shabbat. Moreover, even if one planted a kernel of wheat before Shabbat, it is permissible to pull it out of the ground and eat it on Shabbat, as long as it has not yet taken root. For that matter, fruit which was not fully ripe that was set aside in a special basket, may be eaten, even if it is only barley edible.
The only case in which an edible food becomes Mukse is when the food was not only cast aside before Shabbat, but it also became inedible at a certain stage. For example, if one put grapes or figs on the roof to dry in the sun before Shabbat, they become Mukse. Since the fruit becomes inedible as part of the drying process, it remains Mukse, even if it became edible again on Shabbat.
SUMMARY
Edible food and drink are not Mukse on Shabbat, if they can be accessed in a permissible fashion.
