Things to do, if I was on a desert island alone?

First of all I have to look for water and dried trees. but if there aren't any trees on a desert island, I have to make drinking water. Since seawater includes an amount of salts, I have to filter out seawater to drinking water. We can make drinking water by using sand. Once making drinking water, My life time extended. And then I have to wait to be rescued. If it were not for answer to be rescued, I'd better dig a grave. ^^

Hi [이름]! Good composition! You expressed your ideas really well and the last part was kinda funny. First of all I have to look for water and dried trees. >> First of all, I have to look for water and dried trees.  But if there aren't any trees on a desert island, I have to make drinking water.>>But if there aren't any trees on the island, I have to make drinking water.Since seawater includes an amount of salts, I have to filter out seawater to drinking water. >> Since seawater includes some amount of salt, I have to filter out seawater to make drinking water. We can make drinking water by using sand.>>CorrectOnce making drinking water, My life time extended. >>Once I’ve made drinking water, my lifetime can be extended.And then I have to wait to be rescued. >>CorrectIf it were not for answer to be rescued, I'd better dig a grave. ^^ >>If there isn’t any answer to my rescue call, I’d better dig a grave.