It is considered rude to pour a drink for oneself. In a gesture of hospitality, your drinking partner will pour your drink. You then reciprocate by pouring theirs. If you are attending a gathering or banquet, do not drink until everyone has a glass and raises it in a collective “kampai” (cheers!)
If you do not drink alcohol, it is not impolite to say so and request for other beverages instead. Non-alcoholic beverages that are usually available include alcohol-free beer, tea, juices and carbonated drinks.