In chapter three: Huts on the Beach Ralph and Simon are attempting to erect a third shelter but the two previous shelters must have been erected during the unrecorded elapsed time period which occured between the end of chapter 2 and the begining of chapter 3.
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They make three huts.
In Chapter 3, Ralph, Simon, and Jack were all suppose to help with building the huts, however Jack felt that hunting was more important.
I presume that you are referring to the start of chapter 3: Huts on the beach where Jack is alone in the forest. The answer is that Jack is trying to hunt pigs.
Piggy is the voice of reason in chapter 2 because he insists that they make a fire so they can be rescued. Also in this chapter they use his glasses to light the fire.
Piggy suggests to make a sundial to know the time in lord of the flies