def get_any_idi(sipper):
    """
    Returns the interdrink intervals for a Sipper,
    disregarding side or bottle contents

    Parameters
    ----------
    sipper : Sipper
        sipper data loaded into the Sipper class

    Returns
    -------
    idi_minutes : pandas.Series
        array of the interdrink intervals in minutes

    """
    data = sipper.data
    combined = data['LeftCount'].diff() + data['RightCount'].diff()
    combined.dropna(inplace=True)
    combined = combined[combined > 0]
    idi_delta = combined.index.to_series().diff().dropna()
    idi_minutes = idi_delta.dt.total_seconds()/60
    return idi_minutes