Ball valves are easier to make than a screw pump.
take a length of pipe (I'll use 1cm diameter for the example), cut a piece about 3cm long from it.
Cut a 40mm circle in the middle of two 1cm square metal sheets, and in one cut several small holes around this but leaving the central ring formed from the first cut and enough support to make it strong.
Put a 50mm ball bearing inside the 3cm piece and then solder/weld the one with one hole to one end(call it A) and the one with many holes to the other end(call it B)
when the fluid goes from A to B the ball bearing will move and lodge in the central hole of B but the fluid will go though the other holes. When fluid goes from B to A the ball bearing will move and lodge in the hole of A and block all water going though it.
The sticking point is that I don't have any sheets of metal or any pipe lengths to fabricate it from, and that's the challenge. It's mcgyver style, not 'if i had...' style.
And Ham701, yes, yes it is.