Water bottles for crate??

[kermiy]

Hi,
Does anyone know the best water carriers to have on a crate, we are due to fly back to the UK with our two dogs Tilly & Joey in August and i'd like to ensure they have enough water. They have gerbil/ rabbit bottles that they need to lick to get out i just don't think they would. Also the ones that just clip on the side but the water may spill out when moved?? Help anyone?? Also any advise for flying, this is their first time. I've been lucky enough to get on the same plane with them but unfortunately they are out of my site.......just waiting for a doggy airline to open when they get their own seat, for the cost they should be in 1st class!! lol
Thanks in advance x