What is the difference between Bernoulli's principle and pressure drop in calculating the pressure of the fluid at that particular point?
Can Bernoulli's principle be used when the fluid is water and it is a steady flow?
Can Bernoulli's principle combine with pressure drop along the pipe in calculating the pressure of the fluid?
What is the condition needed to use Bernoulli's principle? Instead of incompressible fluid* inviscid region of flow* steady flow?

Is the pressure drop like formula* like Darcy–Weisbach equation derived from Bernoulli's principle?
Appreciate if someone can answer my question. Thank you.