I have never heard about water-drops on bunny-poop, but some poop can be have a shiny, “oily” residue on them. This substance is often strong-smelling (the smell can vary and might be described as “onion-like” or like corn-chips.Those are the poops the bunny poop-marks with. The marking-poops are often somewhat bigger than the “ordinary” poop. If this is what you’re seeing, it’s perfectly normal and healthy.
Your bunny is 4 months old, which is consistent with her being well on her way into puberty. “Teen-age” bunnies have a strong urge to mark their territory. During this time in their lives, they can lose their litter-box habit almost altogether. It’s not something they do by choice, it’s all controlled by hormones.
Territorial marking often gets a lot better when a bunny has been spayed. It is recommended to always spay girl-rabbits, since they have a very high risk of uterine cancer at age 3-4. She can be spayed at around 6 months.