回答
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we don't just have hot tea, we also have cold (またはiced) tea.
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we don't just drink hot tea, we drink cold tea, too.
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We have iced tea in addition to hot tea.
「熱いお茶だけでなく冷たいお茶もある」= we don't just have hot tea, we also have cold (またはiced) tea. / we don't just drink hot tea, we drink cold tea, too. / We have iced tea in addition to hot tea.
ボキャブラリー
hot tea = 熱いお茶
cold/iced tea = 冷たいお茶
don't just have = ~だけではなく
also have = ~もある
drink = 飲む
in addition to = ~に加えて