Water is like money, the more the better. Take advantage of the space offered from your jeep. More than likely with your 1191, the weight factor is at the fore front of your thinking or at least it should be. Depending on your needs you should be able to carry more than enough water and beer in your jeep. With sufficient beer available your significant other might be more agreeable to spending a few extra nights, so bring as much as possible. Use the space left in your jeep for enough water for an extra shower or two and some potty flushes.