Another vote for anchor trolleys - one on each side.
My next purchase for my yak will be a trolly for the
left side.
Many can get away with a 24' retractible dog leash
and a heavy 24" section of chain, or a dumbbell, or
some sort of anchor. My reservoirs are maybe 20'
at the deepest when flooded.
That said, a drift sock is another option. Or, do what
I did and set up a trolling motor helps a lot
with the wind.
However, wind can still frustrate the daylights out of
me, so there's no perfect solution to stay put or stay
sane in windy conditions, LOL.