Without using brew you can install the dependencies for kivy by manually pasting the following commands in a terminal:
curl -O -L https://www.libsdl.org/release/SDL2-2.0.4.dmg
curl -O -L https://www.libsdl.org/projects/SDL_image/release/SDL2_image-2.0.1.dmg
curl -O -L https://www.libsdl.org/projects/SDL_mixer/release/SDL2_mixer-2.0.1.dmg
curl -O -L https://www.libsdl.org/projects/SDL_ttf/release/SDL2_ttf-2.0.13.dmg
curl -O -L http://gstreamer.freedesktop.org/data/pkg/osx/1.7.1/gstreamer-1.0-1.7.1-x86_64.pkg
curl -O -L http://gstreamer.freedesktop.org/data/pkg/osx/1.7.1/gstreamer-1.0-devel-1.7.1-x86_64.pkg
hdiutil attach SDL2-2.0.4.dmg
sudo cp -a /Volumes/SDL2/SDL2.framework /Library/Frameworks/
This should ask you for your root password, provide it and then paste the following lines in your terminal:
hdiutil attach SDL2_image-2.0.1.dmg
sudo cp -a /Volumes/SDL2_image/SDL2_image.framework /Library/Frameworks/
hdiutil attach SDL2_ttf-2.0.13.dmg
sudo cp -a /Volumes/SDL2_ttf/SDL2_ttf.framework /Library/Frameworks/
hdiutil attach SDL2_mixer-2.0.1.dmg
sudo cp -a /Volumes/SDL2_mixer/SDL2_mixer.framework /Library/Frameworks/
sudo installer -package gstreamer-1.0-1.7.1-x86_64.pkg -target /
sudo installer -package gstreamer-1.0-devel-1.7.1-x86_64.pkg -target /
pip install --upgrade --user cython pillow