Water would be a much better choice for taking out a fire, magical or not because it can smother the entire flame, blocking the flame from accessing the combustion material (probably wood or coal) and blocking access to oxygen.
The only interaction between spellcasting and underwater combat is that creatures that are fully submerged in water are resistant to fire damage. There’s no rule that says lightning damage behaves differently underwater or near water. 1. level 1. · 5 yr. ago Warlock.
How to Deal With Fire Damage in DnD 5e – Don’t Forget …
The generally accepted interpretation is that if an effect says it’s magical, it’s magical. Cantrips are magic by default, so the DM could rule that all cantrips that deal fire damage (like produce flame) are magical flames, and that’s pretty reasonable. But, if you light a torch with produce flame, that torch was magically lit but the torch is …
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How does water put out fire? Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher