Well, most of the time it will be by poking your enemy out of lane if possible. Some champions (Caitlyn, Jhin, Ashe, etc) have some utility that you can utilize. You can often times build a bit tankier if you so chose, but make sure you are still doing damage.... because that is the whole point of double marksmen bott lane.
There are some unique interactions that you should be aware of so that you can successfully choose the correct ones for the situation however.... Sivir is good vs Blitz and Thresh and Naut by baiting out the hooks mostly and then using your shield. Miss Fortune can kill Zyra plants with a Q and make it bounce with a crit on the Zyra or enemy ADC, Ashe has long range stun to help get picks. Ezreal will mostly be Iceborn Gauntlets and either tankier or more damage.... depending on the situation.
That kinda stuff you are looking for?