Planning water supply system for a Norther Michigan cottage that is seasonal, i.e. the water is drained from the plumbing supply system, water heater, etc. before the winter freezing temperatures.

Wondering what type of Water Softener might be recommended. The cottage is not heated during the winter, if freezing temps would damage the unit in any way, e.g. freezing, electronics would need to know this.

Also, should the water softener be installed between the sediment filter and the water heater or before. Thanks.

Have no idea what I should be looking for feature wise, e.g. electronic timers, mechanical, etc. Also, does it reduce the water pressure from the well? Are the big box stores a good place to buy? Where else?