But that is not the rule but the exception. Yes, if you know in advance. And whats wrong with that? Keep the bowl at room temperature, and out of direct sunlight, stirring the contents every day to refresh the surface and avoid mould. Put on a scale, set the reading to zero and add cold water just to cover, taking note of the weight of the water.
Watch the Goodwin read about the displacement of a bowl.
( z0 watch :ARG0 ( z1 you ) :ARG1 ( z2 read :ARG0 ( z3 person :name ( z4 name :op "Goodwin" ) ) :ARG3 ( z5 displace :ARG1 ( z6 bowl ) ) ) :mxde imperative )
(z0 / watch-01
    :ARG0 (z1 / you)
    :ARG1 (z2 / read-01
              :ARG0 (z3 / person
                        :name (z4 / name
                                  :op1 "Goodwin"))
              :ARG3 (z5 / displace-01
                        :ARG1 (z6 / bowl)))
    :mode imperative)
Watch the Goodwin read about the displacement of a bowl .
z0 :ARG0 z1
z0 :mode 1
z3 :name z4
z4 :op1 0
z2 :ARG0 z3
z0 :ARG1 z2
z2 :ARG3 z5
z5 :ARG1 z6