If you start at Sherman Pass, you could probably do the first loop (down Cannell Trail and up Sherman Pass Road Via Cherry Hill Road) in one day and not even load up your bike too much. Then come back to your car, resupply, load up your bike, camp on the summit of Sherman Peak (or if you are worried about water, just camp somewhere off the road so you can get water at your car in the morning). Then summit Sherman Peak and then follow the route below.
Rattlesnake Creek at mile 125 on this route is pretty reliable water (I have never seen it dry), and you will very likely find water at Fish Creek at mile 162 (the creek is just off route). You will want to fill up at these locations.
https://ridewithgps.com/routes/18008615Evdog said Shaffer Trail is a possibility after Sherman Peak too, but I have never done that trail. Trout Creek Trail is one of the nicer trails for sure.
Just be patient on the sandy moto trails. They will not be hard packed this time of year. It is not death sand, but some sections can be annoying.