In general, you can repeat the particle "to" or not as you choose. It's mostly a question of style. I think most people would omit it in your examples, which are short, but it can help re-orient the reader in extended sentences, e.g. "For breakfast, I like to eat bread, which I find very sustaining for the day ahead, and to drink milk". (Notice I moved the "for breakfast". That's because a prepositional clause like that is inherently ambiguous with conjunctions, and it's not always clear whether it would apply to the first arm of the conjunction or not. My relative clause interrupts the flow and makes it more likely for the reader to assume a terminal "for breakfast" only applies to the drinking of milk, so I moved it to the front. )

The following sound natural to me, although where I give 2 answers the situations might be slightly different: 1 (a) 2 (a) and (b) 3 (a) and (b)