The Drought badge is the most tedious achievement in Ice Tycoon 2. Without the Double Water Capacity gamepass and Swift Boots, the Glacial Lake regenerates faster than you can drain it.
The optimal route is to start at the Stream, then move to the Well, then finish at the Glacial Lake. Each source has a different volume, so capacity matters more than raw speed.
Players who clear the badge report that the Industrial Intake tool combined with Swift Boots clears the Glacial Lake in roughly 25 minutes.