What worked for me was an all mighty whack with my big wooden spoon. On the table, silly, not the kitten.
Startles the living daylights out of them. Also broke two spoons.
I find as their muscle strength increases it's usual for them to want to explore areas they couldn't previously reach and there is a spate of table and counter jumping.
Spoon whacking works surprisingly well, even in my absence, though I do sometimes hear a suspicious thump as someone jumps down from a forbidden surface. Then I use cirus potpourri and orange peels. Most cats don't like citrus so bowls of it spread out where he is not to go might work to keep him away. It works for me and smells nice too.
Yeah, lots of kittens like water.