Is it necessary to buy the Isola Water (level 3) to finish game or can I discover all species and magic plants with level 2 water? Also, I have almost all of my bugs (43 0f 48). Do I need the level 3 net to get all of them or can I get them all with level 2 net? Will they all eventually come around with only level 2 net? I am trying to determine what is most important to spend my money on. THX!