Getting the top 1 inch of ocean to evaporate where there is sun to turn into fresh drinkable water

There is a technique known to campers throughout the world to either turn fresh water or ocean water into safe fresh water. It is through the use of clear or black plastic. All you need is enough sun and heat to do this.

So, basically in a camping situation one puts the clear or black plastic and makes a pool of water big enough to evaporate into enough water to drink that day by the end of the day's sun by digging in the sand  a hole and fill that with the water you want to evaporate. Then you take 4 to 6 ml greenhouse plastic either black or clear that is bendable and you make a pool to evaporate from with the sun's rays. then you make a slope for the evaporation to catch on top and slowly turn into drips into a cup or bowl during the day. As long as your water cannot evaporate any poisons to humans when it evaporates you have clean fresh water as long as your plastic also is clean and unused.

But, what I was thinking was you could put large types of simple platforms either floating or with pilings in the ocean where the float would travel up and down the piling making evaporation and water on a sunny day. It would need to be able to travel up and down a wood piling because ocean tides rise and fall all the time.

Or, you could use this same method with a parabolic mirror or mirrors in sync with the sun as it travels and focus it on the top 1  inch of seawater or whatever water you want to purify through evaporation and if you put a piece of black plastic one inch beneath the water it would concentrate the heat and cause very quick evaporation from the sun. The parabolic mirrors since they don't move very fast could be solar cell powered and this could be done on a fairly massive scale to bring water evaporated, re-condensed through pipes onto the land to be stored in tanks or reservoirs for later use or it could be put into water bottles and bottled and shipped and sold for drinking water.

However, you would want screens to screen out larger sea life from fish to birds while doing this from this enclosed plastic structure with only the parabolic mirrors burning down with the sunlight causing fast evaporation up to the top of the plastic structure. The drips would then go down the slope
to where the pure evaporated distilled water would be put into pipes which would take it to shore through gravity feed.

So, this structure would be sort of self sustaining only using solar power to operate and gravity feed to bring the water to shore through pipes. You would install this structure out beyond the highest waves or in a harbor where the structure wouldn't be damaged in a storm. However, in a harbor often boats vent all sorts of oils and stuff and might make the water taste bad if they were there.

So, for the best tasting water that was distilled directly through evaporation and brought to elsewhere by gravity feed one would install this structure beyond where the waves break with only the pipes plastic or metal or rubber going towards the shore.

So, all you likely would need is someone to watch that it continued to make evaporated condensed water every day the sun was out when it was hot enough. So, through solar energy powering the Parabolic mirrors it would be mostly self sustaining with a solar cells as the automatic power source on sunny days.

Both inland and beyond the breakers close to shore both for purifying polluted fresh water and for evaporating the fresh water out of salt water so it is drinkable I think this is a low cost solution in various parts of the world and might solve some problems for people when there is enough warm or hot sun.