If you go to Boots Trish.They sell syringes for giving a child liquid medicine orally.
The packet has a bung in it, for the bottle neck,it's stepped so fits a big range of bottles.You stick it in the neck of the bottle and it has a central hole to fit your syringe in.You can then turn your bottle upside down to fill your syringe.
I picked a couple up a few weeks ago.Little bit more expensive than you can buy syringes for, but does the job.
Yes you could! I don't bother though as I usually wait a while before mixing up liquids and do a big session so taking it off again and again is too much bother.
For now, I only seem to make one or two at a time, but that may increase.
I've bought two types of syringe today: an assortment of sizes 1-10ml that each come with the bottle bungs, and a few in 20ml & 50ml that have a piece of tubing with each.
Rather than mess around thinking about how much is in the tubing, I'll detach the tube before putting the liquid in the bottle and when finished, will dispel it from the tube back into the bottle.
The small syringes I already have will still be fine for concentrates.

