if possible, grind the pills into a powder and mix them with something, like juice - either form a paste you can eat with something (lol poison sandwich? ice cream?) or make it liquid enough that you can drink it fast. be sure to take an anti-emetic starting a week before. just a normal dose, like once a day, then again with a light meal (piece of toast for example) before you consume the poison.
may i ask what pills you were thinking of using? best of luck to you, anon.