You definitely need a tripod for good blurred water motion. Set your shutter speed on something like 1/15 to 1/8. Also some ND filters if it's sunny (because the shutter is open so long you need to block out most of the light).
Similar concept goes for the Milky Way - longer exposure. Most of those shots you see with a dark foreground are blended - one exposure for the milky way, one for the ground. Then you blend them together with HDR software or manually in Photoshop. You need a tripod to make sure both shots are from the exact same spot and angle.
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