juice
Saft is the German word for juice. It is used in the same way as the English word, to refer to the liquid extracted from fruits or vegetables. It can be used to describe both the freshly squeezed juice and the bottled or packaged juice available in stores.
I drink apple juice every morning.
This phrase is stating a daily habit in present tense, drinking apple juice in the morning. 'Jeden Morgen' means 'every morning'. The word 'Saft' is modified with 'Apfel' to specify the type of juice as apple juice, which is quite common in German language.
Would you like more juice?
This phrase is a question and is used to inquire if the listener wants more juice. 'Möchtest du' is a polite way to ask someone if they want something. In Germany, manners are important, and this phrase indicates respect to the listener.
There is fresh orange juice in the supermarket.
This phrase is providing information about what is available in a supermarket. 'Im Supermarkt gibt es' means 'there is in the supermarket'. Like in the first phrase, 'Saft' is modified with 'Orange' to specify the type of juice as orange juice.