A fluid-delivery system, a fluid-delivery device, and an adapter are described herein for applying fluid to tissue. The adapter generally includes a proximal portion and a distal portion. The proximal portion includes a grasping handle to be grasped by a grasping instrument having a pair of jaws, and a collar surrounding the grasping handle to increase a grip on the pair of jaws. The distal portion is adapted to connect with the fluid-delivery device. The fluid-delivery device generally includes a tip to apply the fluid to the tissue, a tip saturator to supply the tip with the fluid, a flow regulator to control fluid flow to the tip saturator, and a fluid housing to contain the fluid which is appliable to the tissue. The fluid-delivery system includes the adapter connected with the fluid-delivery device. The fluid-delivery system is particularly advantageous for marking tissues during endoscopic surgical procedures.