You stated you spent $1,000 on your drone and lost it in the water. You made up the extra money, over and above the cost of your Mavic Air, because of additional batteries you purchased. You allegedly lost your drone which, of course, had just one battery, therefore, your total loss is much less than $1,000. I can not imagine that the cost of flight tickets, assuming there was more than one person, plus your accommodation costs, amounted to less than say $599. Where is the logic in cancelling the trip? You could have run out and bought a used Mavic air for less than what you lost by cancelling the trip or even bought a new one, then returned it after your holiday or working trip, which ever you considered that to be.
In my mind, and I would assume any reasonably logical person's mind, what you supposedly did, of cancelling the flights and accommodation and losing all that money, was simply idiotic, compared to the purchase of a used drone or a rental unit, so to speak. If you are running a business, as you say, then it would make absolutely no sense to do what you did. And I believe that is why so many people reading this believe something smells funny.
The more I think about all that you have said, the more the entire scenario does not make any sense at all. If what you say really did happen, then I would suggest you sit back and re-assess the logic in the way you are running your business. And why in the world are you trying to "Learn" how to fly a drone by flying out over water??? Another illogical action in my mind, though others possibly think that might be a perfectly smart thing to do.