By the Pinn Puzzle Mystery Cache

This is a puzzle cache by the River Pinn, a place I used to explore frequently when I was younger.

This is a puzzle cache. The code is simple, just follow this rule: A+B=C

B+L J-D F+C C×B Z-F K+N C×E U-G M-H D×E I-A R÷B O+C B×J W+B X÷D T-E Q+D C×F . Y-F P-K K×B S-N F+H P+J Y÷E Z-H I+F L+G V-M C×H

R+E M×B O÷C X-F D+K U-A J+M T÷D V-H Q+C E×E Z-G Q-H B×L . E+J W-I K-F U+E K-F N+D G+H S+A G+P U-F

The container is slightly larger than a 35ml canister.