yeah, easy way to make one.
get any bottle
get some clear hose
get a tiny bit of rubber hose, attach the rubber hose to the end of the clear hose and then you can squish the rubber hose over the nipple and watch the fluid come out through the clear hose to see the bubbles. change all the fluid mate but don't pump it all out, pump it out till nearly empty then fill it up and do it again till the fluid changes colour at the nipple, you dont want to run the piston dry, and when bleeding brakes dont press the pedal all the way down, where it hasn't been for 10 years, there will probably be rust around that area and it will rip the seals to parts.