In the US the drink most associated with celebrating is champagne. People drink champagne to celebrate major accomplishments like buying a house, getting a promotion at work, finishing a degree, etc.

I live in Australia, but as far as I know there is no tradition like this in the US or the UK. We do have an expression though, and it goes "I'll drink to that." We say it when we heavily agree with someone or want to celebrate a decision that has been made (which could include purchases). For example, someone might say "thank God it's Friday," to which someone else could reply "I'll drink to that." Or someone might say "I need new clothes," to which someone may reply "I'll drink to that" in agreeance. Hope that helps! :-)