Virtual Villagers 2 - SUPER URGENT QUESTION!?!?

Okay so on Virtual Villagers 2 I am out of coconuts and the ocean has algae, but I don't have enough tech points to buy the last level of farming. I have one and two. How can I keep my villagers alive with no coconuts of fish?!! P.S. If I have to buy tech stuff how much do I need? The only thing I have more levels of is farming - level 2. HELP BEFORE THEY ALL DIE!!