Do you have access to the memory wiping mechanism prior to getting your memory wiped tomorrow?

If so, wipe your memory, leaving yourself a note: "Think of the most unlikely place where you can hide a message, and leave this envelope there." The envelope contains the information you want to pass on.

Then, before your memory is wiped tomorrow, leave yourself a note: "Think of the most unlikely place where you can hide a message, and open the envelope hidden there."

Hopefully, your two memory-wiped selves should be sufficiently similar that the unlikely places they think of will coincide. At the same time, the fact that there is an envelope in the unlikely place you just thought of should be evidence that it came from you.