Change in plans on starting point

We purchased our airline tickets and will be starting our trip on June 16th in Portland, Oregon. The desert in Nevada gave us a lot of concern so we decided to begin further north and add 350 miles to the trip. The eastern desert of Oregon is not too friendly either but after crossing eastern Washington, we know what to expect. We were told to bring 35 pounds of water if we went through Nevada. That would have put my payload at 125 pounds!