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In a large bowl, add sliced cucumbers, tomato wedges and sliced sweet onion. Set the bowl aside while making the marinade.
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In a large mason jar with a lid, add vinegar, water, olive oil, sugar, salt and pepper and shake well. Alternatively, you can whisk all the marinade ingredients together in a bowl.
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Pour marinade over cucumber/tomato mixture in large bowl add sliced basil and stir well.
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Cover bowl with plastic wrap and put it into the refrigerator to chill for about 2 hours.
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Optional: To serve, stir mixture really well then drain most of the marinade out (leaving just about 1/3 cup in the bottom of the bowl.)