Is science a tool, or a source of philosophy?
Rather than being either it its source or its tool, science is a branch of philosophy. For most of western history, what we now know as "science" was called "natural philosophy." Science is philosophy directed to knowing the natural world. In other words, science is a subset of philosophy.
The "scientific method" is a tool. It applies empirical methods to extend knowledge of the world, starting from more limited previous knowledge, observations, and axioms.