Our new-to-us Riviera holds 80 gallons (300 litres) of fresh water, and 160 gallons (600 litres) of fuel. I assume we get similar range as other dual-engine Carvers with this fuel. This kind of boating is new to us - our experience with the Albin 25 was with very economical fuel consumption (36 hp diesel, 7 kts) and bottled water.
My questions:
1. what do you use the water for? I am thinking - washing up, showers, cooking . . . but drinking? Is dockside water supply and 40 year old holding tanks/tubing to be trusted for drinking unboiled water? (not by my wife, no way, whatever your answer might be lol) Or do you bring a few jugs aboard strictly for drinking? What is normal?

2. What sore of range to expect with conservative speeds with this sort of gas storage? Twin 220s btw.

Just wondering what to expect when we finally launch in the spring.