Taking on the Seven Seas

Today, we were given 15 items to decide between in order to help us survive the seven seas. Little did we know we would be trapped out there forever... O_o

Nahhhh j/k, were all safe. The list of fifteen is as follows along with the ranking our team gave them:

1) WATER!!! easily the most essential to life.

2) Army rations, also very important to surviving.

3) Mirror, so i can flash a boat in the distance.

The main thing to surviving the 7 seas is how long you can stay alive for. And with these essential items, you would have the best possible chance for success.

UNITS!

l (distance) - m
t (time) - s
m (mass) - kg
a (area) - m^2
v (velocity) - m/s
p (density) - kg/m^3
g (gravity - m/s^2
F (force) - kg m/s^2
E (energy) - m kgm/s^2
P (power) - kgm^2/s^3