Update:
Seltzer is done and tasted.
Used Mangrove Jacks Yeast + Nutrient
Seen here:
HARD SELTZER YEAST AND NUTRIENT
Going by a few online resources and advice given here. I pitched a total of 4 times (0hrs, 24hrs, 48hrs, 72hrs)
Activity at 0, 24 were spectacular, 48hrs was noticeably less...