I use a large marinade syringe. It's gradated up to 1 oz. (30 ml) so roughly 7 syringes full will give you 200 ml in the bag. I remove the cap, silicon gasket, ball bearing and spring from my bags,...shove the basting needle down in the bag, fill and repeat until filled to the level you desire (7 syringes, 1 oz each will give you just a hair over 200 ml of ink). Drop the spring back in, followed by the ball, silicon gasket and cap. Use something to depress the ball (serves as the valve),...I use a small screwdriver, (the end of a q-tip swab or something similar is fine),...squeeze out the excess air space and then release the ball while holding pressure to insure that no air reenters the bag and you're done.