Put on a scale, set the reading to zero and add cold water just to cover, taking note of the weight of the water. Keep the bowl at room temperature, and out of direct sunlight, stirring the contents every day to refresh the surface and avoid mould. Add a tablespoon of unrefined sugar, honey or maple syrup for every 250g water, stir to dissolve, then cover with a cloth  this will not only protect the fruit from flies, but it will also allow the free flow of oxygen in the bowl or jar. But that is not the rule but the exception. Continue fermenting in the bowl, still covered with a cloth, for another two to four weeks, until it tastes beautifully acidic.
As you, if you decide to drink a 250g of water, you would be protected from flies.
( z0 protect :ARG1 ( z1 you ) :ARG1-of ( z2 resemble ) :ARG2 ( z3 fly ) :condition ( z4 decide :ARG0 z1 :ARG1 ( z5 drink :ARG0 z1 :ARG1 ( z6 water :quant ( z7 mass-quantity :quant 250 :unit ( z8 gram ) ) ) ) ) )
(z0 / protect-01
    :ARG1 (z1 / you)
    :ARG1-of (z2 / resemble-01)
    :ARG2 (z3 / fly-01)
    :condition (z4 / decide-01
                   :ARG0 z1
                   :ARG1 (z5 / drink-01
                             :ARG0 z1
                             :ARG1 (z6 / water
                                       :quant (z7 / mass-quantity
                                                  :quant 250
                                                  :unit (z8 / gram))))))
As you , if you decide to drink a 250 g of water , you would be protected from flies .
z4 :ARG1 z5
z7 :quant 0
z7 :unit z8
z6 :quant z7
z5 :ARG1 z6
z5 :ARG0 z1
z4 :ARG0 z1
z0 :ARG1 z1
z0 :condition z4
z0 :ARG1-of z2
z0 :ARG2 z3