If U want to invite some body irrespective of timing, U may say : CHAI PAANI ke liye. Thsi doesn’t actually mean only Tea and Water. But it’s a general term used. Some times that includes NAASHTAA too.
U may also use : SHEETAL, MRUDU peya - soft drink
Ex. Aap mere yahaa SHEET PAAN, chai paani ke liye kub aaoge ?
Is’t clear ?
Pl contact without prejudice for any further explanation.
Dhanaywaad, fir milenge,
mdchaskar