Plumbing Water tanks

[seayou77]

Please enlighten me on how best to plumb Water tanks. I have two tanks under the settee/bunks and one forward under the Vee. Each has a vent, approx 1/2 inch and a 1/2 inch line in the bottom. There are inspection ports in the top. What there is NOT is an fill.
These days filling water tanks is a gimme that usually happens when at the fuel dock buying a thrifty five or ten gallons of diesel. So it needs to happen rather quickly.
What I plan is an addition of a small tank next to the galley sink. The three belly tanks will be plumbed off this day tank. I plan to shut off the day tank and have a Tee so that I can use this for drinking wtr.
Does that sound like an effective system, which will achieve the desired goal of filling three tanks quickly through the existing half inch lines. I expect to install a valve/manifold which will isolate the tanks.
Thanks for input updating a 1950's system to modern conveniences.

[Gary E]

What there is NOT is an fill.
So how do you fill them?

My opinion, EACH tank MUST have it's own fill pipe and vent, and the 1/2 output tube run to a central easy to get to place where each line will have a shut off, from those shut off's to a pump to provide pressure at the taps. This way you can use water from one tank untill it's dry, then switch to tank #2 or #3 or #....

I would NEVER connect the output of one tank with the output of another tank.

[seayou77]

Thanks for your opinion. I dunno how the tanks were filled, unless the inspection port was used as fill. The manifold will serve to isolate tanks in use and allow filling all tanks at once.