I bought a rockwood freedom pop up camper 2020 and have some questions that for most will be simple I am sure but for someone new at this I need some help. How do you know how much water you have in your fresh water container? Does the 6 gallons of hot water come from the same water tank or are they different tanks to fill? How do you know how much of the six gallons you have left? How do you heat the water? I have looked in my manuals for these answers and onliine and have found nothing. Please help a newbie.