If you have too many mini-sips, watering can be made easier.
Construct your mini-sip with the correct size straw.
Purchase economical pump-up sprayer with nozzle that just happens to fit over that straw perfectly. (Lowes)
Fill sprayer with tempered water and pump up.
Dial the nozzle to put out a full stream.
Mate the nozzle to the end of the straw. ( Just like you would air up a tire.)
Press trigger and hold until water from the overflow straw indicates full.
This method is fast and doesn't leak when done properly. As an aside, I refill sips the next day after the initial filling, because of the rapid uptake of water into the soil on the initial filling. After that, you can usually go quite a few days before filling again, depending on leaf growth, temp., etc.
I can fill 100 mini-sips in 45 minutes. Takes about 6 gal of water. You spend almost as much time filling the tank as you do watering.
I currently have 112 in mini-sips. Managed 95% rooting and looks like at least 90% are going to make it. The small loss I am seeing seems to be mostly thin tip cuttings. Min-sip potting mix is Pro-mix HP with some added lime.