CAIRO - Egyptian President Mohamed Morsi said on Monday he would keep "all options" open to defend Egypt's water supply from being affected by a giant new dam Ethiopia is building on the Nile but he added that Cairo did not want war."Egypt's water security cannot be violated at all," he said in a televised speech to Islamist supporters. "As president of the state, I confirm to you that all options are open.".He later added: "We are not calling for war, but we will never permit our water security ... to be threatened."Using emotive language to underline the importance of the Nile to Egypt, he quoted a popular song about the river and said: "If it diminishes by one drop then our blood is the alternative."