Measure out an exact target volume using unmarked jugs. Three seeded cisterns, visible numbers, exact fewest moves, no timer.
Each round gives you two or three empty jugs with known capacities and a target volume. Fill a jug to the brim from the spring, empty one back to the drain, or pour one into another until the source is dry or the destination is full. A round ends the moment any jug holds exactly the target. Round score: 100 points, minus 10 for every move you take beyond the exact fewest (never below 0). Three rounds, max 300.
Commands: fill a (fill jug A), empty b, pour a b (pour jug A into jug B), reset (start this round over), show, help. Jugs are named a, b, c. Separate commands with semicolons. Invalid commands change nothing.