I would like to know if there is a simple device for washing hand with
fresh water.

My boat is a 18-ft center console that is too small for adding a sink
and faucet in it; moreover, a sink and faucet is overkill for my
need. I will wash my hand in sal****er, and then use freshwater as
the last step to wash away the sal****er from my hand. Therefore, I
only need a small amount of fresh water. I have a feeling that one-
gallon of freshwater should be more than enough for several persons
use in a fishing trip. I would like to know a neat way to accomplish
this.

What I am looking for is something works like a garden hand-pump spray
bottle. Then I can put the water tank under the floor, run a short
lengh of water hose to the back of the boat and connecting to a small
water faucet, somehow having a small hand pump next to the faucet.
When I need to use it, all I need to do is pump it several times, turn
on the faucet to let out a stream of water spray to wash the sal****er
away from my hand (or wash the eyeglasses), let the water to run down
to the floor and get air dried or drained to the scuppers. When I am
done, I simply turn off the faucet. The next guy who wants to use it
probably doesn't need to pump because there should still be enough
water pressure in the system.

Is there such a thing available in the market?

Currently, I use a one-gal water bottle and pour over my hands. But
this is not neat and is not elegant. Moreover, this tends to use more
water than I really need.

I have thought of using a store-bought large spring water tank that
has a small faucet at the bottom and use gravity to dispense the
water. But this requires me to put the water tank a couple feet above
the floor. I would like to put the water tank under the floor to
lower the center of gravity as much as possible (afterall it is a
small boat).

Thanks for any pointer in advance.

Jay Chan