I just mixed 100 grams of rye flour with 100 ml of bottled water in
a covered bowl on my kitchen counter. No yeast, no salt, no milk,
no sugar. How long should it take before I see some life? (I
haven't done this in a few years and I don't remember.) Gonna try
making sourdough pizza crust; will switch over to wheat flour when I
start feeding it.

Do I need to feed and divide it a few times before I freeze some of
it for insurance? I plan to grow it at room temperature for a few
weeks, then move it to the refrigerator to slow it down.

Bob