The first four trucks carrying 80 tons of sodium hypochlorite water chlorination supplies crossed the Jordanian border into Syria last Sunday, heading for Aleppo, Hama, Idleb and Homs.
About 420,000 people, half of them children, need urgent humanitarian aid in Homs, UNICEF said last week.
Meanwhile, there have been no signs of reconciliation between the Syrian government and the opposition.
Opposition leader Moaz Alkhatib on Monday urged the government to start talks for its departure from power, a motion unlikely to be accepted by the Syrian government, which has yet to respond.
Diplomatic efforts to end the Syria crisis persist. On Feb. 6-7, a summit of the Organization of Islamic Cooperation will be held in Cairo, with the Syrian situation high on its agenda.
A 9-year-old girl and her father are traveling to 31 major cities across China on foot and by hitchhiking.