Ah yeah… I see it now… I was gonna use tasmota with Counters as a conf, but no idea how to make it realtime, since I can only lower the TelePeriod to 10s… so if the tap is only open for 5s it will not give me realtime… well in fairness I’m prob overcomplicating 
The counter will still count the pulses. It just informs home assistant about the total every 10sec.
You won’t miss any pulses.
If there is flow for 3 seconds right after the last tasmota transmission, it will be updated in home assistant after 7 seconds.