Is it safe to put frozen water bottle in heated hot water?

Its summer nowadays and really hot outside so I normally take my water bottle and freeze it then take it out and let it thaw. however ive recently started to take the frozen bottle out and put it onto a bowl of hot water that i heated in the microwave. is it dangerous to keep drinking water like this? i know theres... show more Its summer nowadays and really hot outside so I normally take my water bottle and freeze it then take it out and let it thaw. however ive recently started to take the frozen bottle out and put it onto a bowl of hot water that i heated in the microwave. is it dangerous to keep drinking water like this? i know theres already chemicals in the water in the first place before frozen because of the plastic,but am i putting more chemicals in by freezing and then heating it? Is it dangerous from chemicals or anything. btw i know this is kind of a stupid question but i know heat+plastic+water dont normally make a good equation.
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