PBS

0.80% NaCl
0.02% KCl
0.02 M PO4, pH 7.3

2XPBS

8.0 g NaCl
0.2 g KCl
200 ml 0.1 M PO4 Buffer, pH 7.3
300 ml dH2O

When diluted 1:1 with dH2O, final concentrations are 0.8% NaCl, 0.02% KCl and 0.02 M PO4.