Why?

So I can start rooting them like there is no tomorrow. rooting in water is easy for me.

Most woody plants - and that includes fruit trees - do not root well in water. Relatively easy to grow from cuttings (if taken at the right time of year) but just not in water.

whats the best time to take cuttings from peaches, and plum trees?

Why don't you plug the terms ... prunus propagation cuttings ... into Google. You might be surprised at how much information is at your fingertips.

high density spacing in prepared beds in late February to early March. Budding occurs between late May and early June.