Landon,
Lightweight merino socks typically, preferably Darn Tough or Defeet- I've had great experiences with their offerings in the durability dept, several pairs I own are over 2 years now and show little sign of wear.
For river crossings I scout a route across and keep my socks and shoes on- occasionally I'll stop and remove deposited river sediment that's worked it's way through the mesh to avoid blistering and rubbing holes through my socks or skin- this can happen in quick order if neglected for too long, especially with the porous design of the MT101's.
If there's only going to be a single stream crossing and the possibility of getting my shoes dry before evening is unlikely, I'll take the time to remove my shoes and socks, cross, then lace up and move on to camp with dry shoes. Typically I don't mind wet feet, they don't last long down here in NM while hiking and are often a reprieve.