I want what I hope is a simple circuit but I've googled and searched this forum, not found it.

When a SPST digital programmable timer completes a circuit, I want one motor to run. On the next circuit completion from the timer the other motor. Next time, the first motor, and so on.

I can do this with two timers, each set on different times. But I would like to know if there is a simple way to do it with one timer.

Do NOT want a circuit that must be energized all day long. Over time that increases greatly the battery and solar requirements. Something like a latching relay? A bi stable flip flop maybe?

The application: A chicken coop door. Two water reservoirs. To open, fill the bottle on the door pulley. To close, pump from the door pulley bottle to the bottom reservoir. I can use an up timer and down timer but I think this can be done with some kind of latching relay or something.

The goal is to be very low-cost and simple. If the alternative to two timers costs more than the second $5 timer, I'll go with two timers.