Chevy, You can get the manual style windshield washer bottle that just has a plastic fitting at the bottom. Those came with the "push with your foot to squirt" bulb under the dash. That way you can run a longer hose towards the battery, then down and around, hidden out of site. It will stay full whatever length it is.
Are you sure that you don't want to just fix the windshield squirters and get another overflow bottle? Just hide it somewhere if you need the stock look.
Rob