YOU SAID:
I'm going to get a cuppa
INTO JAPANESE
一杯飲みに行きます
BACK INTO ENGLISH
I'm going to have a drink
INTO JAPANESE
飲み物を飲みに行きます
BACK INTO ENGLISH
go get a drink
INTO JAPANESE
飲み物を取りに行きます
BACK INTO ENGLISH
go get a drink
Well done, yes, well done!