Jesus And The Man With A Legion

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Physical fire and water can't destroy them - only the spiritual properties of them can harm demons. Perhaps what we see/feel as water/fire is a mere glimpse of the truth of fire and water, which may have greater properties throughout the universe than we can know. Like a symbol of the greater whole. Possibly.

And if that were so, then why would we expect every single evil spirit to have been destroyed? We haven't all drwoned or got burned to ash, because we know to avoid the physical dangers, and so maybe evil spirits do the same?

You are correct in that evil spirits can avoid fire and water same as we can.

Consider though if fire and/or water could literally destroy or even incapacitate a demon don't you think that we as Christians could on purpose destroy them by now.

After all if fire and/or water was the "silver bullet" for demons we would have been provided the way to rid the earth of them and would have accomplished that by now.

The Bible would have also told us so. However we were given the Name of Jesus, a Name above every name, and in that Name we have authority over the devil, demons and such to cast them out.