For competition swimming you could always use (for practice)
a good kickboard Women's Vanquisher googles a pull bouy a silicon bathing cap a drag suit paddles a timer a water bottle
For competition...
Equipment for practices include:
Practice suit and drag suit: These increase the drag (resistance) in the water so when you take them off to race you go alot faster
Goggles: For the sole purpose of...
You need a baton. You need your legs too. And last but not least, you need your brains to send out the signals or you're never gonna move from the starting line. Wait, you're never gonna move from...