Just a simple travel cup from Wally World.. I use air line tubing and control valve to deliver water to my tanks sump although it's hard to get a good slow drip with these type of valves in my case it works fine as I'm using lime water as my TO source and after starting the drip at around 1 drop every 10 seconds it slows down as the valve gets clogged with calcium to about 1 drop every 20+ seconds.. This works fine on my 14 gal nano and I used this same type system on a larger scale for my 90 gal system for over 10 years with no issues.
I just blow into the cups "spout" to start the siphon, adjust the drip and hang it on a hook behind my TV that you can see on the left side of this pic and its completely out of sight..