app
aqua
background
barrel
bright
clean
color
colorful
container
contour
drink
drip
drop
element
energy
faucet
flat
flow
fuel
gas
glowing
handle
icon
illustration
isolated
leak
light
line
linear
liquid
natural
neon
oil
outline
pure
purity
rain
recycle
recycling
refresh
save
set
sign
simple
symbol
water