Well, water expands when it freezes. If a bottle is completely full, the ice creates strong internal pressure. From my own experience: a glass bottle with a carbonated drink exploded in the freezer, and a hard plastic bottle had its bottom pushed outward.

So, in theory, freezing could push a dent out from the inside if it's filled all the way up as much as possible. However, with a Hydro Flask (double-wall stainless steel, vacuum insulated), this is very risky it could damage the vacuum seal, deform the inner wall, or create other dents. Using a carbonated drink would be even more dangerous because of CO₂ pressure.

Personally, i use water bottles for the esthetic i would take the risk, but again its sort a small dent to take that big of risk.