A Really Cheap Solution
This may or may not work for you depending upon your waterfront but I simply tie my jet ski diagonally between a cleat on my dock and a pin on the shoreline. To describe the pin, think of a three foot long corkscrew made of at least half-inch steel with an eyelet on top. You just locate an appropriate spot and screw it into the ground. I have no idea where to get one - mine was on the property when I bought it 25 years ago. You do want to use a decent size line and be sure it is not being abraded. If the water level drops too much I simply move the line to a cleat further out on the dock. You probably want to have at least a couple of feet of water under the jet ski.
When I want to go for a ride, I just wade out to the jet ski, unhook it front and back and take off.
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