\begin{tikzpicture}[node distance = 3.5cm, auto]
  \node [start] (init) {Mix \qty{50}{\gram} flour + \qty{50}{\gram} water, stir};
  \node [block, right of=init] (wait2) {Wait\\ \qty{24}{\hour}};
  \path [line] (init) -- (wait2);
  \node [block, below of=wait2, node distance=3.5cm] (feed) {\qty{10}{\gram} of previous day + \qty{50}{\gram} water + \qty{50}{\gram} flour, stir};
  \path [line] (wait2) -- (feed);
  \node [block, below of=feed] (discard) {Discard the rest};
  \path [line] (feed) -- (discard);
  \node [decision, right of=feed, node distance=3.5cm] (decide) {Is good?};
  \node [decision, above of=decide, node distance=3.5cm] (timeout) {Less than 10 feeds?};
  \node [fail, right of=timeout, node distance=3.5cm] (discard2) {Batch failed};
  \path [line] (timeout) -- node{no} (discard2);
  \path [line] (timeout) -- node{yes} (wait2);
  \path [line] (feed) -- (decide);
  \node [success, right of=decide, node distance=3.5cm] (use) {Ready to use};
  \path [line] (decide) -- node{no} (timeout);
  \path [line] (wait2) -- (feed);
  \path [line] (decide) -- node{yes} (use);

  \node [start, below of=discard, left of=discard] (start_n) { Start with Initial Mixture };
  \node [block, right of=start_n, node distance = 3.2cm] (wait_n) { Wait\\ \qty{24}{\hour} };
  \node [decision, right of=wait_n, node distance = 3.2cm] (readycheck_n) { Ready? };
  \node [block, below of=wait_n, node distance = 3cm] (feed_n) { Feed the Mixture };
  \node [decision, right of=feed_n, node distance = 3.2cm] (limitcheck_n) { Failed? };
  \node [fail, right of=limitcheck_n, node distance = 3.2cm] (abort_n) { Discard All, Start Over };
  \node [success, right of=readycheck_n, node distance = 3.2cm] (final_n) { Done };

  \draw [thick, -{Latex}] (start_n) -- (wait_n);
  \draw [thick, -{Latex}] (wait_n) -- (readycheck_n);
  \draw [thick, -{Latex}] (feed_n) -- (wait_n);
  \draw [thick, -{Latex}] (readycheck_n) -- node { No } (limitcheck_n);
  \draw [thick, -{Latex}] (limitcheck_n) -- node (feedok_n) { No } (feed_n) ;
  \draw [thick, -{Latex}] (limitcheck_n) -- node { Yes } (abort_n);
  \draw [thick, -{Latex}] (readycheck_n) -- node { Yes } (final_n);

  \node [below of=feedok_n, node distance=4.5cm] (details1) [shape=rectangle,draw,fill=white!90!black]{
        \begin{tabular}{l}
	    \fontsize{7}{9}\selectfont For the \emph{Initial Mixture}, mix \qty{50}{\gram} flour/\qty{50}{\gram} water. \\
            \fontsize{7}{9}\selectfont The Mixture is \emph{Ready} when it has \emph{grown}, has \emph{bubbles}, and \emph{smells} vinegary/yoghurty. \\
            \fontsize{7}{9}\selectfont The Mixture has \emph{Failed} when you have fed it too many (eg 10) times without success. \\
	    \fontsize{7}{9}\selectfont To \emph{Feed the Mixture}, discard all but \qty{10}{\gram}, mix in \qty{50}{\gram} flour and \qty{50}{\gram} water.
        \end{tabular}
    };

%  Feel free to comment out and see how it looks similar to above
%  \node [below of=details1, node distance=1.5cm, align=left] (details2) [shape=rectangle,draw,fill=white!90!black]{
%	    \fontsize{7}{9}\selectfont For the \emph{Initial Mixture}, mix
%        \qty{50}{\gram} flour/\qty{50}{\gram} water.\\
%            \fontsize{7}{9}\selectfont The Mixture is \emph{Ready} when it has
%            \emph{grown}, has \emph{bubbles}, and \emph{smells}
%            vinegary/yoghurty. \\
%
%            \fontsize{7}{9}\selectfont The Mixture has \emph{Failed} when you
%            have fed it too many (eg 10) times without success.\\
%
%	    \fontsize{7}{9}\selectfont To \emph{Feed the Mixture}, discard all but \qty{10}{\gram}, mix in \qty{50}{\gram} flour and \qty{50}{\gram} water.
%  };

  \node [below of=details1, node distance=2.5cm] (detailsced) [shape=rectangle,draw,fill=white!90!black]{
      \begin{tabular}{@{}ll@{}}
          \textbf{Initial Mixture}:& Mix \qty{50}{\gram} flour/\qty{50}{\gram} water. \\
          \textbf{Feed the Mixture}:& Discard all but \qty{10}{\gram}, mix in \qty{50}{\gram} flour and \qty{50}{\gram} water\\
          \textbf{Ready}:& The mixture has \emph{grown}, has \emph{bubbles}, and \emph{smells} vinegary/yoghurty. \\
          \textbf{Failed}: & The mixture has been fed too many (eg 10) times without success. \\
        \end{tabular}
    };
\end{tikzpicture}