Peugeot 206 1.1 "55" Reg Coolant

[DocArbathnot]

Hi

Just checking fluids on MIL's car. Coolant a bit low (maybe 1/2 ltr), checked the book and it requires Peugeot coolant and does not require changing.

Do I have to go to the Peugeot dealer or just bung in a bit of blue or red stuff?