The film should not see more than a 4degree temperature change from solution to solution either. - I mix my own. Microdol is:

750 ml water
100g sodium sulfite
5g metol
30g sodium chloride
water to make 1 liter.

Capacity is 4 8x10 at normal times - 2 8x10 at 5% and 2 8x10 at 10%
rate your film down 1/2 stop or so.

1 roll is about 1 8x10
cut the batch in half and cut the capacity in half - now you can streach it over more months.