I need to know how to make the letters wiggle like that, not too much, just so that they "catch life" so to speak.
Also I guess the various water drops and animations, are actually drew with a tablet in AE? If that`s the case, is there any way to make a brush more interesting and maybe shine a little bit when I draw and animate?
Text undulation (wiggle is a specific AE tool/script): Looks like there is a time posterization on a "distort" effect. Offhand guess is that turbulent displace with changing evolution would work, though to make it look better stacking more than one "distortion" effect should work better.
Water effects: A lot more to break down here, which I'm not going to attempt and instead I'll answer simply. The assets were most likely not created in AE, but likely as vector illustrations in Illustrator. There is plenty you can do to pretty up a brush stroke, far too much to try and list.