Translation:What is your favorite beverage in the summer?
I left out "the" and lost a heart. I think DL is wrong on this and that the definite article, which is missing in the Italian, is also not necessary in English. I will tick "My answer should be accepted"
There is a slight difference in meaning, as "What is your favorite beverage in the summer?" asks what you like to drink in summer, while "What is your favorite summer drink?" asks what you like most among drinks related to summer. Going for a paradox, my favorite beverage during summer could be hot chocolate instead of a summer drink. Madness aside, the most direct translation for "What is your favorite summer drink?" would be "Qual è la tua bibita estiva preferita?".