I made an addon that displays your mana regen ticks after the 5 seconds wait are over after casting a mana consuming spell,
before mana starts regenning, every 2 sec after that mana regens.

The first tick will always have to be estimated, usually 0.1-0.5 ish seconds after the 5 second blue bar fills.
All the ticks after that should be 100% on time with your mana regen since it uses the first mana regen tick as the base for the timer...

Enjoy finally drink walking without having to guess mana ticks again ! I've been looking for an addon or weakaura that does this for 3.3.5 for a long ass time so I just ended up making one...

Commands:

/fsr — (Shows all commands and their intended usage.)

/fsr scale <0.5–3.0> — (Sets the total scale of FSRTracker, Default: 1.0.)

/fsr scalex <0.5–3.0> — (Sets the horizontal stretch (width) of FSRTracker, Default: 1.0)

/fsr scaley <0.5–3.0> — (Sets the vertical stretch (height) of FSRTracker, Default: 1.0)

/fsr unlock — (Unlocks FSRTracker)

/fsr lock — (Locks FSRTracker)

/fsr center — (Centers FSRTracker horizontally)

/fsr bg — (Toggles the bar background on/off, only show the spark/line)

/fsr cd — (Toggles numeric countdown on bar on/off)

/fsr front — (Changes FSRTracker's priority it has over other UI Elements to MAX, so you can display it over your Unit Frame for example.)

/fsr strata <BACKGROUND|LOW|MEDIUM|HIGH|DIALOG|FULLSCREEN|FULLSCREEN_DIALOG|TOOLTIP> — (More commands for strata incase FSRT draws over something else you don't want, or if the Strata is still too low, ordered from lowest to highest priority.)

/fsr level <0-20000> — (Finetune command for level incase FSRT draws over something else you don't want, or if the level is still too low.)

/fsr reset — (Resets FSRTracker completely, back to factory settings xd)

/fsr seed — (reseed baseline from current regen (use while not casting/drinking))