On Sunday my riding partner and I started in Ventura and went up Hwy 33 toward Rose Valley. Due entirely to my being a wimp we didn't make it. I bonked about a mile before the first tunnel from the heat, lack of fuel, and no fitness.
On the way back we stopped at the Friends Ranch packing house to soak my jersey to cool me off. There's a spigot, as you face the building, on the right corner near the Orange trees. Water was cool and drinkable.