Water bottles with no potion ingredients in them have a red texture similar to a healing potion. I double checked to make sure this wasn't an error with my resource packs, and it's not. It still occurs with default vanilla textures.
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[Mojang] Mega_Spud (Jay)
migrated
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-34167.
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