ي采ت جون آ_SM1 نصف جالون من قهوة البرد المبردة كل 4 أيام. كم كوب قهوة يشرب في اليوم؟

Note: The measure "SM1" here may be an error or a missing variable in the original English text. If it's supposed to represent "buys", the correct term in Arabic is already there ("ي采ت"). If it stands for a quantity, it should be replaced with a correct Arabic quantity term. The original sentence didn't have a clear specification for what John does with "1/2 gallon jugs", which could be either 'buying' (as is suggested by 'buys') or 'using' or 'consuming'. I have interpreted it as 'buying'. However, without more context, the exact translation might slightly vary. 

A more accurate or complete translation might be possible with more context or clarification about the inserted "SM1". Anyway, everything else in your sentence was translated well, and this word will likely be replaced as you intended in the text you use this translation for. 

Nevertheless the act of drinking coffee can't directly related to buying coffee unless there's a specified rate of consumption- in this case, the sentence didn't provide that. Thus, the translation ends with a question that apparently can't be specifically answered with the given information. 

So, in our case it should be as following based on the original sentence: 
جون يشتري نصف جالون من قهوة البرد كل أربعة أيام. كم كوب قهوة يشرب في اليوم؟
However, this question cannot be properly answered with the given data.
يفضل شرب 128/2 = 64 أوقية من القهوة كل 4 أيام
这意味着 يشرب 64/4 = 16 أوقية من القهوة في اليوم
لذا يشرب 16/8 = 2 كوب في اليوم
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