Metroid Room 1
|Metroid Room 2||Adjacent rooms||Tourian First Room|
If you shoot to freeze each Metroid and use a Super to kill it, you can grab the drops from all 4 Metroids, while only taking about 40 damage from the acid.
As you fall off the first ledge, you can fire a shot when you're near the ground, and it should freeze the first Metroid in place, and you can shoot a Super as you approach. This should allow you to pick up some but not all of its drops.
After this, one option is to group the remaining three Metroids together with Space Jumps, and a mockball on the floor after the acid. Watch out that you don't overshoot any of the Metroids though, because if they go off the right edge of the screen, it can be difficult to get them back on screen so you can take them out.