凉水 (liáng shuǐ) means “cold water”

More examples

夏天我喜欢喝一杯凉水。xià tiān wǒ xǐ huān hē yì bēi liáng shuǐ

In summer, I like drinking a glass of cold water.

Water served cool rather than hot, with its temperature central to drinking or cooling.

冷水léng shuǐ: Water that feels cold when drunk.
冰水bīng shuǐ: Very cold water with ice in it.

未加热、温度较低的水，常用来解渴或降温。wèi jiā rè wēn dù jiào dī de shuǐ cháng yòng lái jié kě huò jiàng wēn

凉水 (liángshuǐ, "cold water") is a transparent compound of 凉 (liáng, "cool") + 水 (shuǐ, "water"), so its meaning follows directly from its two parts.

In an everyday drink order, this word normally asks for water that is not hot; ice is a separate request, so the word alone does not guarantee an iced drink.