You need to proceed with Lucy's questline for a bit, Then only you can enter the gym.
Alright how on earth do I give Lucy the sport bottle? I have bought it with achievement points and go to her after 3pm, I only have to option to go to the gym with her but nothing happens there. I can only repeat this over and over.
I gave this game another try after a long long while, giving up last time due to bugs. I wanna like this game, I really do, but damn someone needs to give it a full makeover to clear all the bugs out.
It seems like you already gave her the bottle.
Otherwise you can't even go to the gym with her, the game will mention you need to find something that she's missing.
You need to go to the gym with her like 15 times for the quest to continue.
options such as sleeping pills, monica on the beach and other problems with monica for repairing the PC which goes in an endless loop do not appear
Monica's starting quest is borked. The wrong variable is set so you can't meet her at the beach after 3pm ever. Not sure if this is intentional.
If you want to go further down the quest line, input into the browser dev console
SugarCube.State.variables.MonicaCheerleader1=0
after you finish all the Prologue Quests.