In a code language, '639' means 'water is drink', '316' means 'juice is drink' and '219' means 'water or juice'. Find the code for 'or'.

Let's decipher the word codes step-by-step by comparing the statements:
1. Compare 'water is drink' (639) and 'juice is drink' (316):
* Common words: 'is', 'drink'
* Common digits: '3', '6'
* So, the codes for 'is' and 'drink' are 3 and 6 in some order.

2. From 'water is drink' (639), the remaining word 'water' must correspond to the remaining digit 9.
3. From 'juice is drink' (316), the remaining word 'juice' must correspond to the remaining digit 1.
4. Now analyze the third statement: 'water or juice' (219):
* We already know 'water' = 9 and 'juice' = 1.
* The remaining word 'or' must match the remaining digit, which is 2.