There are two in game solutions I can think of;
1: when trying to tame a dino, just knock it out, then use cheat dotame. This allows you to go through the work of knocking out a dino (the only fun part of taming anyway) and dotame tames it but you still need a saddle to ride.
2. The other solution is to put troughs down and fill those up to keep everything topped up. You can also use trek troughs and edit spoil timers to prevent all the food from decomposing. All it takes to fill them up is a small amount of time and a few admin commands
hope this helps?