It is not a masterpiece in terms of artistry, but here is a Walkthrough for the Snow Ruins. It shows both the paths to the Shortcut Stairway and the Isolated Stairway on each Floor.
Although I did not find Energy Drink X in any Treasure Chest or White Urn on the 4th or 5th Floors of the Lava Ruins, Sue, who asked for the Walkthrough for the Snow Ruins, managed to find Energy Drink X on the 3rd Floor of the Lava Ruins. Well done!
I have created a separate post describing the path to the chamber on the 3rd Floor that often yields E. Drink X.
You will find Energy Drink X very often in the twin Towers built on the Floating Chamber of Whale Island. That would be the easiest method of obtaining it if you haven't the Skill to make it yourself yet. Simply take Rune Stones to Whale Island and either climb the rope or use the Circle Portal (if you have defeated the Giant Squid) to go directly to the upper levels, then open all the doors of the twin Towers and search the Treasure Chests... I usually would find 4 to 8 Energy Drink X in a single visit, not to mention all the Little Crystals of various levels. (More likely to find 4 Energy Drinks than 8, in all honesty...) In fact, using a Grass Stone for each door at the Tower of Life, as soon as you climb the Rope, you should be able to net at least 2 Energy Drink X from the Treasure Chests behind the locked doors. If your levels are low, there is no need to fight any Monsters as you can avoid triggering the action of the Generator if you are careful to creep along the southern wall.
The locked doors in the Tower of Life require Grass Runeys, however, and I personally would advocate a visit to the Tower of Birth instead, where all Rune Stones are accepted and you therefore can use Water Rune Stones. The Tower of Life yields only Level 2 Little Crystals as well as E. Drink X. Level 2 is not significantly better than the Level 1 Little Crystals found in the Tower of Birth, where you can use Water Rune Stones to unlock the doors. Grass Runeys tend to be the most precious but Water Runeys are generated in great quantities in all seasons.
Remember that the best tools can be made effectively with only Level 1 Little Crystals as you then can use two pieces of Scrap Iron to upgrade them to higher levels. It is only when forging the best weapons that you would be advised to use higher levels of Little Crystals. The Tower of Glory yields Level 8 Little Crystals as well as E. Drink X. If your levels are low, however, you should limit yourself to explorations in the Tower of Life as you then can avoid combat with powerful Monsters.