Collecting all the bottles per episode will unlock the episode's safe. The locations listed below are found in no particular order. Each location also has it's corresponding spot on the map so refer to the map, descriptions and pictures below.
Safe:
Reward: Clockwerk's Eye
Located inside a cavern by the river.
01-07:
1. Outside of the hideout, jump on the springy mushroom to reach this on top of a stone pillar
2. Northeast of the hideout, on top of a rock pillar. The springy mushroom is beside the rope bridge.
3. After finding #2, cross the rope to find it along the way.
4. After finding #3, find this bottle inside the hollow rock ahead.
5. Further east by the waterfall, you'll find another bottle on top of a platform. Use the springy mushroom beneath it to reach it.
6. After getting #5, climb the nearby rope to find this bottle in the nest above.
7. After getting #6, glide to the north to get this bottle at the tail of the spoon-tail dinosaur.
8. Northwest of the spoon-tail dinosaur lies a bird nest perched at the very top of the stone pillar. You have to cross the rope to reach it. Trace the other end of the rope so you can easily get on it.
9-11:
9. At the roof of the hideout
10. South of the hideout, by the land bridge
11. West of the hideout, by the bird nest past the broken rail tracks
12. This is found along the high rope leading to a treasure (Dino Egg) west of the hideout. It's a bit tricky to reach it to refer to the video below for more information.
13. Found in the riverside to the west, to the right of the wooden platform
14-16:
14. Find the rope leading inside the fortress near the southwest bridge. You should find this bottle at the end of that rope
15. There's a lone bottle at the edge of the cliff to the southwest portion of the map. You should see it below after getting #14.
16. On the tail of the spoon-tail dinosaur inside the fortress. Hard to miss.
17. Inside the ice cavern under the ice fortress to the west. It is floating above a pit of chemicals.
18. On top of the statue in the western ice fortress
19. In the middle of the ice bridge, to the west.
20. After getting #19, head west and climb the lamp post there. The bottle should be inside the large skull.
21. Inside the narrow ice path.
22. Floating above the protruding, giant skeleton in the lake / waterfall to the northwest.
23-26:
23. On top of a lamp post to the northwestern ice bridge
24. Inside a skull. You need to paraglide and use the steam to gain height
25. On a nest east of the lake/ waterfall, connected by two ropes.
26. Near #26, there's a bottle flying up in the air. Use the steam while paragliding to reach it
27. Behind the skeleton, in the northern portion of the map.
28-30:
28. This is found below the land bridge to the north, on top of a stone pillar.
29. Found inside a skull, in a cavern
30. Found under the wooden bridge to the northwest. You have to ride a glacier to get it.