im honestly so confused how amazon works for groups and im sorry if this is a dumb question! im super excited because im planning a big weekend trip with 4 friends and i want us all to use the same shopping cart so we can split the cost of the supplies like snacks and a new cooler. can we all log in at the same time and add stuff or will it mess everything up?

• our budget is roughly 150 dollars
• i need it to work on the iphone app
• it has to be simple so my friends dont get frustrated

is there some kind of group link or something i can send them so we can all shop together...