I got a couple of ideas

1. Collect water from bamboo stems
2. If you use your wire saw and do manage to cut a banana tree down (about 60cm from ground level). Make a bowl shape in what is left standing up. The tree will continue to suck up fresh water for at least 24hours. Collect and consume.
3. The top of (young) palm trees are edible and very tasty. These also contain a lot of liquid.
4. Collect water from plants that have a flower like a naturally shaped "bucket".
5. You could use an Indian well in saturated ground

Keep watching the distillation posts.

Hope this gives you some ideas.

Reinhardt